VOL-1558 Update vendored voltha-go and other items

Result of running dep ensure.  golang openolt now
builds.

Also update dockerfile to used specific alpine version

Change-Id: I1e5407e25bb0636a241a0650d1e44e5df567f44b
diff --git a/vendor/github.com/opencord/voltha-go/db/model/transaction.go b/vendor/github.com/opencord/voltha-go/db/model/transaction.go
new file mode 100644
index 0000000..fa8de1d
--- /dev/null
+++ b/vendor/github.com/opencord/voltha-go/db/model/transaction.go
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * 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 model
+
+import (
+	"github.com/opencord/voltha-go/common/log"
+)
+
+type Transaction struct {
+	proxy *Proxy
+	txid  string
+}
+
+func NewTransaction(proxy *Proxy, txid string) *Transaction {
+	tx := &Transaction{
+		proxy: proxy,
+		txid:  txid,
+	}
+	return tx
+}
+func (t *Transaction) Get(path string, depth int, deep bool) interface{} {
+	if t.txid == "" {
+		log.Errorf("closed transaction")
+		return nil
+	}
+	// TODO: need to review the return values at the different layers!!!!!
+	return t.proxy.Get(path, depth, deep, t.txid)
+}
+func (t *Transaction) Update(path string, data interface{}, strict bool) interface{} {
+	if t.txid == "" {
+		log.Errorf("closed transaction")
+		return nil
+	}
+	return t.proxy.Update(path, data, strict, t.txid)
+}
+func (t *Transaction) Add(path string, data interface{}) interface{} {
+	if t.txid == "" {
+		log.Errorf("closed transaction")
+		return nil
+	}
+	return t.proxy.Add(path, data, t.txid)
+}
+func (t *Transaction) Remove(path string) interface{} {
+	if t.txid == "" {
+		log.Errorf("closed transaction")
+		return nil
+	}
+	return t.proxy.Remove(path, t.txid)
+}
+func (t *Transaction) Cancel() {
+	t.proxy.cancelTransaction(t.txid)
+	t.txid = ""
+}
+func (t *Transaction) Commit() {
+	t.proxy.commitTransaction(t.txid)
+	t.txid = ""
+}