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/k8s.io/api/storage/v1/types.go b/vendor/k8s.io/api/storage/v1/types.go
index bd60e10..9f2f67b 100644
--- a/vendor/k8s.io/api/storage/v1/types.go
+++ b/vendor/k8s.io/api/storage/v1/types.go
@@ -204,7 +204,7 @@
 	Time metav1.Time `json:"time,omitempty" protobuf:"bytes,1,opt,name=time"`
 
 	// String detailing the error encountered during Attach or Detach operation.
-	// This string may be logged, so it should not contain sensitive
+	// This string maybe logged, so it should not contain sensitive
 	// information.
 	// +optional
 	Message string `json:"message,omitempty" protobuf:"bytes,2,opt,name=message"`