[VOL-2235] Mocks and interfaces for rw-core

This update consists of mocks that are used by the rw-core
during unit testing.  It also includes interfaces used for unit
tests.

Change-Id: I20ca1455c358113c3aa897acc6355e0ddbc614b7
diff --git a/vendor/go.etcd.io/etcd/etcdserver/api/v2v3/cluster.go b/vendor/go.etcd.io/etcd/etcdserver/api/v2v3/cluster.go
new file mode 100644
index 0000000..a22e4af
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/etcdserver/api/v2v3/cluster.go
@@ -0,0 +1,31 @@
+// Copyright 2017 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v2v3
+
+import (
+	"go.etcd.io/etcd/etcdserver/api/membership"
+	"go.etcd.io/etcd/pkg/types"
+
+	"github.com/coreos/go-semver/semver"
+)
+
+func (s *v2v3Server) ID() types.ID {
+	// TODO: use an actual member ID
+	return types.ID(0xe7cd2f00d)
+}
+func (s *v2v3Server) ClientURLs() []string                  { panic("STUB") }
+func (s *v2v3Server) Members() []*membership.Member         { panic("STUB") }
+func (s *v2v3Server) Member(id types.ID) *membership.Member { panic("STUB") }
+func (s *v2v3Server) Version() *semver.Version              { panic("STUB") }