VOL-1497 : Add more control to kv/memory access

- Added kv locking mechanism (etcd only)
- (watch) control path access whenever possible
- (watch) use a transaction for updates and merge with memory
- cleaned up vendoring
- misc changes to fix exceptions found along the way

Amendments:

- Copyright header got removed in auto-generated file
- Changed default locking to false for KV list operation
- Updated backend api to allow the passing of locking parameter

Change-Id: Ie1a55d3ca8b9d92ae71a85ce42bb22fcf1419e2c
diff --git a/vendor/github.com/hashicorp/consul/api/operator_keyring.go b/vendor/github.com/hashicorp/consul/api/operator_keyring.go
index 6b61429..038d5d5 100644
--- a/vendor/github.com/hashicorp/consul/api/operator_keyring.go
+++ b/vendor/github.com/hashicorp/consul/api/operator_keyring.go
@@ -16,6 +16,9 @@
 	// Segment has the network segment this request corresponds to.
 	Segment string
 
+	// Messages has information or errors from serf
+	Messages map[string]string `json:",omitempty"`
+
 	// A map of the encryption keys to the number of nodes they're installed on
 	Keys map[string]int