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/generated.proto b/vendor/k8s.io/api/storage/v1/generated.proto
index 7ac6cb2..668c854 100644
--- a/vendor/k8s.io/api/storage/v1/generated.proto
+++ b/vendor/k8s.io/api/storage/v1/generated.proto
@@ -178,7 +178,7 @@
   optional k8s.io.apimachinery.pkg.apis.meta.v1.Time time = 1;
 
   // 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
   optional string message = 2;