diff --git a/automation/vendor/github.com/juju/schema/LICENSE b/automation/vendor/github.com/juju/schema/LICENSE
new file mode 100644
index 0000000..ade9307
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/LICENSE
@@ -0,0 +1,191 @@
+All files in this repository are licensed as follows. If you contribute
+to this repository, it is assumed that you license your contribution
+under the same license unless you state otherwise.
+
+All files Copyright (C) 2015 Canonical Ltd. unless otherwise specified in the file.
+
+This software is licensed under the LGPLv3, included below.
+
+As a special exception to the GNU Lesser General Public License version 3
+("LGPL3"), the copyright holders of this Library give you permission to
+convey to a third party a Combined Work that links statically or dynamically
+to this Library without providing any Minimal Corresponding Source or
+Minimal Application Code as set out in 4d or providing the installation
+information set out in section 4e, provided that you comply with the other
+provisions of LGPL3 and provided that you meet, for the Application the
+terms and conditions of the license(s) which apply to the Application.
+
+Except as stated in this special exception, the provisions of LGPL3 will
+continue to comply in full to this Library. If you modify this Library, you
+may apply this exception to your version of this Library, but you are not
+obliged to do so. If you do not wish to do so, delete this exception
+statement from your version. This exception does not (and cannot) modify any
+license terms which apply to the Application, with which you must still
+comply.
+
+
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
diff --git a/automation/vendor/github.com/juju/schema/README.md b/automation/vendor/github.com/juju/schema/README.md
new file mode 100644
index 0000000..78ad8a1
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/README.md
@@ -0,0 +1,5 @@
+juju/schema
+===========
+
+This package provides helpers for coercing dynamically typed data structures
+into known forms.
diff --git a/automation/vendor/github.com/juju/schema/checker.go b/automation/vendor/github.com/juju/schema/checker.go
new file mode 100644
index 0000000..8682136
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/checker.go
@@ -0,0 +1,71 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"strings"
+)
+
+// The Coerce method of the Checker interface is called recursively when
+// v is being validated.  If err is nil, newv is used as the new value
+// at the recursion point.  If err is non-nil, v is taken as invalid and
+// may be either ignored or error out depending on where in the schema
+// checking process the error happened. Checkers like OneOf may continue
+// with an alternative, for instance.
+type Checker interface {
+	Coerce(v interface{}, path []string) (newv interface{}, err error)
+}
+
+// Any returns a Checker that succeeds with any input value and
+// results in the value itself unprocessed.
+func Any() Checker {
+	return anyC{}
+}
+
+type anyC struct{}
+
+func (c anyC) Coerce(v interface{}, path []string) (interface{}, error) {
+	return v, nil
+}
+
+// OneOf returns a Checker that attempts to Coerce the value with each
+// of the provided checkers. The value returned by the first checker
+// that succeeds will be returned by the OneOf checker itself.  If no
+// checker succeeds, OneOf will return an error on coercion.
+func OneOf(options ...Checker) Checker {
+	return oneOfC{options}
+}
+
+type oneOfC struct {
+	options []Checker
+}
+
+func (c oneOfC) Coerce(v interface{}, path []string) (interface{}, error) {
+	for _, o := range c.options {
+		newv, err := o.Coerce(v, path)
+		if err == nil {
+			return newv, nil
+		}
+	}
+	return nil, error_{"", v, path}
+}
+
+// pathAsPrefix returns a string consisting of the path elements
+// suitable for using as the prefix of an error message. If path
+// starts with a ".", the dot is omitted.
+func pathAsPrefix(path []string) string {
+	if len(path) == 0 {
+		return ""
+	}
+	var s string
+	if path[0] == "." {
+		s = strings.Join(path[1:], "")
+	} else {
+		s = strings.Join(path, "")
+	}
+	if s == "" {
+		return ""
+	}
+	return s + ": "
+}
diff --git a/automation/vendor/github.com/juju/schema/const.go b/automation/vendor/github.com/juju/schema/const.go
new file mode 100644
index 0000000..cbd03b8
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/const.go
@@ -0,0 +1,57 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// Const returns a Checker that only succeeds if the input matches
+// value exactly.  The value is compared with reflect.DeepEqual.
+func Const(value interface{}) Checker {
+	return constC{value}
+}
+
+type constC struct {
+	value interface{}
+}
+
+func (c constC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if reflect.DeepEqual(v, c.value) {
+		return v, nil
+	}
+	return nil, error_{fmt.Sprintf("%#v", c.value), v, path}
+}
+
+// Nil returns a Checker that only succeeds if the input is nil. To tweak the
+// error message, valueLabel can contain a label of the value being checked to
+// be empty, e.g. "my special name". If valueLabel is "", "value" will be used
+// as a label instead.
+//
+// Example 1:
+// schema.Nil("widget").Coerce(42, nil) will return an error message
+// like `expected empty widget, got int(42)`.
+//
+// Example 2:
+// schema.Nil("").Coerce("", nil) will return an error message like
+// `expected empty value, got string("")`.
+func Nil(valueLabel string) Checker {
+	if valueLabel == "" {
+		valueLabel = "value"
+	}
+	return nilC{valueLabel}
+}
+
+type nilC struct {
+	valueLabel string
+}
+
+func (c nilC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if reflect.DeepEqual(v, nil) {
+		return v, nil
+	}
+	label := fmt.Sprintf("empty %s", c.valueLabel)
+	return nil, error_{label, v, path}
+}
diff --git a/automation/vendor/github.com/juju/schema/errors.go b/automation/vendor/github.com/juju/schema/errors.go
new file mode 100644
index 0000000..f62f58e
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/errors.go
@@ -0,0 +1,25 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"fmt"
+)
+
+type error_ struct {
+	want string
+	got  interface{}
+	path []string
+}
+
+func (e error_) Error() string {
+	path := pathAsPrefix(e.path)
+	if e.want == "" {
+		return fmt.Sprintf("%sunexpected value %#v", path, e.got)
+	}
+	if e.got == nil {
+		return fmt.Sprintf("%sexpected %s, got nothing", path, e.want)
+	}
+	return fmt.Sprintf("%sexpected %s, got %T(%#v)", path, e.want, e.got, e.got)
+}
diff --git a/automation/vendor/github.com/juju/schema/fieldmap.go b/automation/vendor/github.com/juju/schema/fieldmap.go
new file mode 100644
index 0000000..765f7e3
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/fieldmap.go
@@ -0,0 +1,170 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// Omit is a marker for FieldMap and StructFieldMap defaults parameter.
+// If a field is not present in the map and defaults to Omit, the missing
+// field will be ommitted from the coerced map as well.
+var Omit omit
+
+type omit struct{}
+
+type Fields map[string]Checker
+type Defaults map[string]interface{}
+
+// FieldMap returns a Checker that accepts a map value with defined
+// string keys. Every key has an independent checker associated,
+// and processing will only succeed if all the values succeed
+// individually. If a field fails to be processed, processing stops
+// and returns with the underlying error.
+//
+// Fields in defaults will be set to the provided value if not present
+// in the coerced map. If the default value is schema.Omit, the
+// missing field will be omitted from the coerced map.
+//
+// The coerced output value has type map[string]interface{}.
+func FieldMap(fields Fields, defaults Defaults) Checker {
+	return fieldMapC{fields, defaults, false}
+}
+
+// StrictFieldMap returns a Checker that acts as the one returned by FieldMap,
+// but the Checker returns an error if it encounters an unknown key.
+func StrictFieldMap(fields Fields, defaults Defaults) Checker {
+	return fieldMapC{fields, defaults, true}
+}
+
+type fieldMapC struct {
+	fields   Fields
+	defaults Defaults
+	strict   bool
+}
+
+var stringType = reflect.TypeOf("")
+
+func hasStrictStringKeys(rv reflect.Value) bool {
+	if rv.Type().Key() == stringType {
+		return true
+	}
+	if rv.Type().Key().Kind() != reflect.Interface {
+		return false
+	}
+	for _, k := range rv.MapKeys() {
+		if k.Elem().Type() != stringType {
+			return false
+		}
+	}
+	return true
+}
+
+func (c fieldMapC) Coerce(v interface{}, path []string) (interface{}, error) {
+	rv := reflect.ValueOf(v)
+	if rv.Kind() != reflect.Map {
+		return nil, error_{"map", v, path}
+	}
+	if !hasStrictStringKeys(rv) {
+		return nil, error_{"map[string]", v, path}
+	}
+
+	if c.strict {
+		for _, k := range rv.MapKeys() {
+			ks := k.String()
+			if _, ok := c.fields[ks]; !ok {
+				return nil, fmt.Errorf("%sunknown key %q (value %#v)", pathAsPrefix(path), ks, rv.MapIndex(k).Interface())
+			}
+		}
+	}
+
+	vpath := append(path, ".", "?")
+
+	out := make(map[string]interface{}, rv.Len())
+	for k, checker := range c.fields {
+		valuev := rv.MapIndex(reflect.ValueOf(k))
+		var value interface{}
+		if valuev.IsValid() {
+			value = valuev.Interface()
+		} else if dflt, ok := c.defaults[k]; ok {
+			if dflt == Omit {
+				continue
+			}
+			value = dflt
+		}
+		vpath[len(vpath)-1] = k
+		newv, err := checker.Coerce(value, vpath)
+		if err != nil {
+			return nil, err
+		}
+		out[k] = newv
+	}
+	for k, v := range c.defaults {
+		if v == Omit {
+			continue
+		}
+		if _, ok := out[k]; !ok {
+			checker, ok := c.fields[k]
+			if !ok {
+				return nil, fmt.Errorf("got default value for unknown field %q", k)
+			}
+			vpath[len(vpath)-1] = k
+			newv, err := checker.Coerce(v, vpath)
+			if err != nil {
+				return nil, err
+			}
+			out[k] = newv
+		}
+	}
+	return out, nil
+}
+
+// FieldMapSet returns a Checker that accepts a map value checked
+// against one of several FieldMap checkers.  The actual checker
+// used is the first one whose checker associated with the selector
+// field processes the map correctly. If no checker processes
+// the selector value correctly, an error is returned.
+//
+// The coerced output value has type map[string]interface{}.
+func FieldMapSet(selector string, maps []Checker) Checker {
+	fmaps := make([]fieldMapC, len(maps))
+	for i, m := range maps {
+		if fmap, ok := m.(fieldMapC); ok {
+			if checker, _ := fmap.fields[selector]; checker == nil {
+				panic("FieldMapSet has a FieldMap with a missing selector")
+			}
+			fmaps[i] = fmap
+		} else {
+			panic("FieldMapSet got a non-FieldMap checker")
+		}
+	}
+	return mapSetC{selector, fmaps}
+}
+
+type mapSetC struct {
+	selector string
+	fmaps    []fieldMapC
+}
+
+func (c mapSetC) Coerce(v interface{}, path []string) (interface{}, error) {
+	rv := reflect.ValueOf(v)
+	if rv.Kind() != reflect.Map {
+		return nil, error_{"map", v, path}
+	}
+
+	var selector interface{}
+	selectorv := rv.MapIndex(reflect.ValueOf(c.selector))
+	if selectorv.IsValid() {
+		selector = selectorv.Interface()
+		for _, fmap := range c.fmaps {
+			_, err := fmap.fields[c.selector].Coerce(selector, path)
+			if err != nil {
+				continue
+			}
+			return fmap.Coerce(v, path)
+		}
+	}
+	return nil, error_{"supported selector", selector, append(path, ".", c.selector)}
+}
diff --git a/automation/vendor/github.com/juju/schema/lists.go b/automation/vendor/github.com/juju/schema/lists.go
new file mode 100644
index 0000000..635425a
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/lists.go
@@ -0,0 +1,44 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"reflect"
+	"strconv"
+)
+
+// List returns a Checker that accepts a slice value with values
+// that are processed with the elem checker.  If any element of the
+// provided slice value fails to be processed, processing will stop
+// and return with the obtained error.
+//
+// The coerced output value has type []interface{}.
+func List(elem Checker) Checker {
+	return listC{elem}
+}
+
+type listC struct {
+	elem Checker
+}
+
+func (c listC) Coerce(v interface{}, path []string) (interface{}, error) {
+	rv := reflect.ValueOf(v)
+	if rv.Kind() != reflect.Slice {
+		return nil, error_{"list", v, path}
+	}
+
+	path = append(path, "[", "?", "]")
+
+	l := rv.Len()
+	out := make([]interface{}, 0, l)
+	for i := 0; i != l; i++ {
+		path[len(path)-2] = strconv.Itoa(i)
+		elem, err := c.elem.Coerce(rv.Index(i).Interface(), path)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, elem)
+	}
+	return out, nil
+}
diff --git a/automation/vendor/github.com/juju/schema/maps.go b/automation/vendor/github.com/juju/schema/maps.go
new file mode 100644
index 0000000..31242a0
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/maps.go
@@ -0,0 +1,93 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// Map returns a Checker that accepts a map value. Every key and value
+// in the map are processed with the respective checker, and if any
+// value fails to be coerced, processing stops and returns with the
+// underlying error.
+//
+// The coerced output value has type map[interface{}]interface{}.
+func Map(key Checker, value Checker) Checker {
+	return mapC{key, value}
+}
+
+type mapC struct {
+	key   Checker
+	value Checker
+}
+
+func (c mapC) Coerce(v interface{}, path []string) (interface{}, error) {
+	rv := reflect.ValueOf(v)
+	if rv.Kind() != reflect.Map {
+		return nil, error_{"map", v, path}
+	}
+
+	vpath := append(path, ".", "?")
+
+	l := rv.Len()
+	out := make(map[interface{}]interface{}, l)
+	keys := rv.MapKeys()
+	for i := 0; i != l; i++ {
+		k := keys[i]
+		newk, err := c.key.Coerce(k.Interface(), path)
+		if err != nil {
+			return nil, err
+		}
+		vpath[len(vpath)-1] = fmt.Sprint(k.Interface())
+		newv, err := c.value.Coerce(rv.MapIndex(k).Interface(), vpath)
+		if err != nil {
+			return nil, err
+		}
+		out[newk] = newv
+	}
+	return out, nil
+}
+
+// StringMap returns a Checker that accepts a map value. Every key in
+// the map must be a string, and every value in the map are processed
+// with the provided checker. If any value fails to be coerced,
+// processing stops and returns with the underlying error.
+//
+// The coerced output value has type map[string]interface{}.
+func StringMap(value Checker) Checker {
+	return stringMapC{value}
+}
+
+type stringMapC struct {
+	value Checker
+}
+
+func (c stringMapC) Coerce(v interface{}, path []string) (interface{}, error) {
+	rv := reflect.ValueOf(v)
+	if rv.Kind() != reflect.Map {
+		return nil, error_{"map", v, path}
+	}
+
+	vpath := append(path, ".", "?")
+	key := String()
+
+	l := rv.Len()
+	out := make(map[string]interface{}, l)
+	keys := rv.MapKeys()
+	for i := 0; i != l; i++ {
+		k := keys[i]
+		newk, err := key.Coerce(k.Interface(), path)
+		if err != nil {
+			return nil, err
+		}
+		vpath[len(vpath)-1] = fmt.Sprint(k.Interface())
+		newv, err := c.value.Coerce(rv.MapIndex(k).Interface(), vpath)
+		if err != nil {
+			return nil, err
+		}
+		out[newk.(string)] = newv
+	}
+	return out, nil
+}
diff --git a/automation/vendor/github.com/juju/schema/numeric.go b/automation/vendor/github.com/juju/schema/numeric.go
new file mode 100644
index 0000000..ec88e56
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/numeric.go
@@ -0,0 +1,197 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"reflect"
+	"strconv"
+)
+
+// Bool returns a Checker that accepts boolean values only.
+func Bool() Checker {
+	return boolC{}
+}
+
+type boolC struct{}
+
+func (c boolC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v != nil {
+		switch reflect.TypeOf(v).Kind() {
+		case reflect.Bool:
+			return v, nil
+		case reflect.String:
+			val, err := strconv.ParseBool(reflect.ValueOf(v).String())
+			if err == nil {
+				return val, nil
+			}
+		}
+	}
+	return nil, error_{"bool", v, path}
+}
+
+// Int returns a Checker that accepts any integer value, and returns
+// the same value consistently typed as an int64.
+func Int() Checker {
+	return intC{}
+}
+
+type intC struct{}
+
+func (c intC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v == nil {
+		return nil, error_{"int", v, path}
+	}
+	switch reflect.TypeOf(v).Kind() {
+	case reflect.Int:
+	case reflect.Int8:
+	case reflect.Int16:
+	case reflect.Int32:
+	case reflect.Int64:
+	case reflect.String:
+		val, err := strconv.ParseInt(reflect.ValueOf(v).String(), 0, 64)
+		if err == nil {
+			return val, nil
+		} else {
+			return nil, error_{"int", v, path}
+		}
+	default:
+		return nil, error_{"int", v, path}
+	}
+	return reflect.ValueOf(v).Int(), nil
+}
+
+// Uint returns a Checker that accepts any integer or unsigned value, and
+// returns the same value consistently typed as an uint64. If the integer
+// value is negative an error is raised.
+func Uint() Checker {
+	return uintC{}
+}
+
+type uintC struct{}
+
+func (c uintC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v == nil {
+		return nil, error_{"uint", v, path}
+	}
+	switch reflect.TypeOf(v).Kind() {
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return reflect.ValueOf(v).Uint(), nil
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		val := reflect.ValueOf(v).Int()
+		if val < 0 {
+			return nil, error_{"uint", v, path}
+		}
+		// All positive int64 values fit into uint64.
+		return uint64(val), nil
+	case reflect.String:
+		val, err := strconv.ParseUint(reflect.ValueOf(v).String(), 0, 64)
+		if err == nil {
+			return val, nil
+		} else {
+			return nil, error_{"uint", v, path}
+		}
+	default:
+		return nil, error_{"uint", v, path}
+	}
+}
+
+// ForceInt returns a Checker that accepts any integer or float value, and
+// returns the same value consistently typed as an int. This is required
+// in order to handle the interface{}/float64 type conversion performed by
+// the JSON serializer used as part of the API infrastructure.
+func ForceInt() Checker {
+	return forceIntC{}
+}
+
+type forceIntC struct{}
+
+func (c forceIntC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v != nil {
+		switch vv := reflect.TypeOf(v); vv.Kind() {
+		case reflect.String:
+			vstr := reflect.ValueOf(v).String()
+			intValue, err := strconv.ParseInt(vstr, 0, 64)
+			if err == nil {
+				return int(intValue), nil
+			}
+			floatValue, err := strconv.ParseFloat(vstr, 64)
+			if err == nil {
+				return int(floatValue), nil
+			}
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			return int(reflect.ValueOf(v).Int()), nil
+		case reflect.Float32, reflect.Float64:
+			return int(reflect.ValueOf(v).Float()), nil
+		}
+	}
+	return nil, error_{"number", v, path}
+}
+
+// ForceUint returns a Checker that accepts any integer or float value, and
+// returns the same value consistently typed as an uint64. This is required
+// in order to handle the interface{}/float64 type conversion performed by
+// the JSON serializer used as part of the API infrastructure. If the integer
+// value is negative an error is raised.
+func ForceUint() Checker {
+	return forceUintC{}
+}
+
+type forceUintC struct{}
+
+func (c forceUintC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v != nil {
+		switch vv := reflect.TypeOf(v); vv.Kind() {
+		case reflect.String:
+			vstr := reflect.ValueOf(v).String()
+			intValue, err := strconv.ParseUint(vstr, 0, 64)
+			if err == nil {
+				return intValue, nil
+			}
+			floatValue, err := strconv.ParseFloat(vstr, 64)
+			if err == nil {
+				if floatValue < 0 {
+					return nil, error_{"uint", v, path}
+				}
+				return uint64(floatValue), nil
+			}
+		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+			return reflect.ValueOf(v).Uint(), nil
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			val := reflect.ValueOf(v).Int()
+			if val < 0 {
+				return nil, error_{"uint", v, path}
+			}
+			// All positive int64 values fit into uint64.
+			return uint64(val), nil
+		case reflect.Float32, reflect.Float64:
+			val := reflect.ValueOf(v).Float()
+			if val < 0 {
+				return nil, error_{"uint", v, path}
+			}
+			return uint64(val), nil
+		}
+	}
+	return nil, error_{"uint", v, path}
+}
+
+// Float returns a Checker that accepts any float value, and returns
+// the same value consistently typed as a float64.
+func Float() Checker {
+	return floatC{}
+}
+
+type floatC struct{}
+
+func (c floatC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v == nil {
+		return nil, error_{"float", v, path}
+	}
+	switch reflect.TypeOf(v).Kind() {
+	case reflect.Float32:
+	case reflect.Float64:
+	default:
+		return nil, error_{"float", v, path}
+	}
+	return reflect.ValueOf(v).Float(), nil
+}
diff --git a/automation/vendor/github.com/juju/schema/size.go b/automation/vendor/github.com/juju/schema/size.go
new file mode 100644
index 0000000..1ad0caa
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/size.go
@@ -0,0 +1,42 @@
+// Copyright 2016 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"github.com/juju/utils"
+	"reflect"
+)
+
+// Size returns a Checker that accepts a string value, and returns
+// the parsed string as a size in mebibytes see: https://godoc.org/github.com/juju/utils#ParseSize
+func Size() Checker {
+	return sizeC{}
+}
+
+type sizeC struct{}
+
+// Coerce implements Checker Coerce method.
+func (c sizeC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v == nil {
+		return nil, error_{"string", v, path}
+	}
+
+	typeOf := reflect.TypeOf(v).Kind()
+	if typeOf != reflect.String {
+		return nil, error_{"string", v, path}
+	}
+
+	value := reflect.ValueOf(v).String()
+	if value == "" {
+		return nil, error_{"empty string", v, path}
+	}
+
+	v, err := utils.ParseSize(value)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return v, nil
+}
diff --git a/automation/vendor/github.com/juju/schema/strings.go b/automation/vendor/github.com/juju/schema/strings.go
new file mode 100644
index 0000000..75f6120
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/strings.go
@@ -0,0 +1,155 @@
+// Copyright 2015 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"fmt"
+	"net/url"
+	"reflect"
+	"regexp"
+)
+
+// String returns a Checker that accepts a string value only and returns
+// it unprocessed.
+func String() Checker {
+	return stringC{}
+}
+
+type stringC struct{}
+
+func (c stringC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v != nil && reflect.TypeOf(v).Kind() == reflect.String {
+		return reflect.ValueOf(v).String(), nil
+	}
+	return nil, error_{"string", v, path}
+}
+
+// URL returns a Checker that accepts a string value that must be parseable as a
+// URL, and returns a *net.URL.
+func URL() Checker {
+	return urlC{}
+}
+
+type urlC struct{}
+
+func (c urlC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v != nil && reflect.TypeOf(v).Kind() == reflect.String {
+		s := reflect.ValueOf(v).String()
+		u, err := url.Parse(s)
+		if err != nil {
+			return nil, error_{"valid url", s, path}
+		}
+		return u, nil
+	}
+	return nil, error_{"url string", v, path}
+}
+
+// SimpleRegexp returns a checker that accepts a string value that is
+// a valid regular expression and returns it unprocessed.
+func SimpleRegexp() Checker {
+	return sregexpC{}
+}
+
+type sregexpC struct{}
+
+func (c sregexpC) Coerce(v interface{}, path []string) (interface{}, error) {
+	// XXX The regexp package happens to be extremely simple right now.
+	//     Once exp/regexp goes mainstream, we'll have to update this
+	//     logic to use a more widely accepted regexp subset.
+	if v != nil && reflect.TypeOf(v).Kind() == reflect.String {
+		s := reflect.ValueOf(v).String()
+		_, err := regexp.Compile(s)
+		if err != nil {
+			return nil, error_{"valid regexp", s, path}
+		}
+		return v, nil
+	}
+	return nil, error_{"regexp string", v, path}
+}
+
+// UUID returns a Checker that accepts a string value only and returns
+// it unprocessed.
+func UUID() Checker {
+	return uuidC{}
+}
+
+type uuidC struct{}
+
+var uuidregex = regexp.MustCompile(`[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}`)
+
+func (c uuidC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v != nil && reflect.TypeOf(v).Kind() == reflect.String {
+		uuid := reflect.ValueOf(v).String()
+		if uuidregex.MatchString(uuid) {
+			return uuid, nil
+		}
+	}
+	return nil, error_{"uuid", v, path}
+}
+
+// Stringified returns a checker that accepts a bool/int/float/string
+// value and returns its string. Other value types may be supported by
+// passing in their checkers.
+func Stringified(checkers ...Checker) Checker {
+	return stringifiedC{
+		checkers: checkers,
+	}
+}
+
+type stringifiedC struct {
+	checkers []Checker
+}
+
+func (c stringifiedC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if newStr, err := String().Coerce(v, path); err == nil {
+		return newStr, nil
+	}
+	_, err := OneOf(append(c.checkers,
+		Bool(),
+		Int(),
+		Float(),
+		String(),
+		URL(),
+	)...).Coerce(v, path)
+	if err != nil {
+		return nil, err
+	}
+	return fmt.Sprintf("%#v", v), nil
+}
+
+// NonEmptyString returns a Checker that only accepts non-empty strings. To
+// tweak the error message, valueLabel can contain a label of the value being
+// checked, e.g. "my special name". If valueLabel is "", "string" will be used
+// as a label instead.
+//
+// Example 1:
+// schema.NonEmptyString("widget").Coerce("", nil) will return an error message
+// like `expected non-empty widget, got string("")`.
+//
+// Example 2:
+// schema.NonEmptyString("").Coerce("", nil) will return an error message like
+// `expected non-empty string, got string("")`.
+func NonEmptyString(valueLabel string) Checker {
+	if valueLabel == "" {
+		valueLabel = "string"
+	}
+	return nonEmptyStringC{valueLabel}
+}
+
+type nonEmptyStringC struct {
+	valueLabel string
+}
+
+func (c nonEmptyStringC) Coerce(v interface{}, path []string) (interface{}, error) {
+	label := fmt.Sprintf("non-empty %s", c.valueLabel)
+	invalidError := error_{label, v, path}
+
+	if v == nil || reflect.TypeOf(v).Kind() != reflect.String {
+		return nil, invalidError
+	}
+	if stringValue := reflect.ValueOf(v).String(); stringValue != "" {
+		return stringValue, nil
+	}
+	return nil, invalidError
+}
diff --git a/automation/vendor/github.com/juju/schema/time.go b/automation/vendor/github.com/juju/schema/time.go
new file mode 100644
index 0000000..9521a2a
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/time.go
@@ -0,0 +1,41 @@
+// Copyright 2016 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"reflect"
+	"time"
+)
+
+// Time returns a Checker that accepts a string value, and returns
+// the parsed time.Time value. Emtpy strings are considered empty times.
+func Time() Checker {
+	return timeC{}
+}
+
+type timeC struct{}
+
+// Coerce implements Checker Coerce method.
+func (c timeC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v == nil {
+		return nil, error_{"string or time.Time", v, path}
+	}
+	var empty time.Time
+	switch reflect.TypeOf(v).Kind() {
+	case reflect.TypeOf(empty).Kind():
+		return v, nil
+	case reflect.String:
+		vstr := reflect.ValueOf(v).String()
+		if vstr == "" {
+			return empty, nil
+		}
+		v, err := time.Parse(time.RFC3339Nano, vstr)
+		if err != nil {
+			return nil, err
+		}
+		return v, nil
+	default:
+		return nil, error_{"string or time.Time", v, path}
+	}
+}
diff --git a/automation/vendor/github.com/juju/schema/time_duration.go b/automation/vendor/github.com/juju/schema/time_duration.go
new file mode 100644
index 0000000..71e75fe
--- /dev/null
+++ b/automation/vendor/github.com/juju/schema/time_duration.go
@@ -0,0 +1,42 @@
+// Copyright 2016 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package schema
+
+import (
+	"reflect"
+	"time"
+)
+
+// TimeDuration returns a Checker that accepts a string value, and returns
+// the parsed time.Duration value. Emtpy strings are considered empty time.Duration
+func TimeDuration() Checker {
+	return timeDurationC{}
+}
+
+type timeDurationC struct{}
+
+// Coerce implements Checker Coerce method.
+func (c timeDurationC) Coerce(v interface{}, path []string) (interface{}, error) {
+	if v == nil {
+		return nil, error_{"string or time.Duration", v, path}
+	}
+
+	var empty time.Duration
+	switch reflect.TypeOf(v).Kind() {
+	case reflect.TypeOf(empty).Kind():
+		return v, nil
+	case reflect.String:
+		vstr := reflect.ValueOf(v).String()
+		if vstr == "" {
+			return empty, nil
+		}
+		v, err := time.ParseDuration(vstr)
+		if err != nil {
+			return nil, err
+		}
+		return v, nil
+	default:
+		return nil, error_{"string or time.Duration", v, path}
+	}
+}