VOL-1460 Updated core to use voltha-protos instead of local protos
Moved protos to python directory in order to maintain functionaly of containers built there.
Added capability to do local builds of protos
Added instructions on running dep ensure for getting protos.
Updated github.com/golang/protobuf version to v1.3.1

Change-Id: Ia6ef55f07f0d5dcb5b750d7c37b21b71db85bfc4
diff --git a/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/helpers.go b/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/helpers.go
index b41d549..b4dc78b 100644
--- a/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/helpers.go
+++ b/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/helpers.go
@@ -228,6 +228,12 @@
 	return &Preconditions{UID: &u}
 }
 
+// NewRVDeletionPrecondition returns a DeleteOptions with a ResourceVersion precondition set.
+func NewRVDeletionPrecondition(rv string) *DeleteOptions {
+	p := Preconditions{ResourceVersion: &rv}
+	return &DeleteOptions{Preconditions: &p}
+}
+
 // HasObjectMetaSystemFieldValues returns true if fields that are managed by the system on ObjectMeta have values.
 func HasObjectMetaSystemFieldValues(meta Object) bool {
 	return !meta.GetCreationTimestamp().Time.IsZero() ||