[VOL-4290] Voltha go library updates for gRPC migration

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/go.etcd.io/etcd/clientv3/compact_op.go b/vendor/go.etcd.io/etcd/clientv3/compact_op.go
index 5779713..41e80c1 100644
--- a/vendor/go.etcd.io/etcd/clientv3/compact_op.go
+++ b/vendor/go.etcd.io/etcd/clientv3/compact_op.go
@@ -15,7 +15,7 @@
 package clientv3
 
 import (
-	pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
+	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
 )
 
 // CompactOp represents a compact operation.