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

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/go.etcd.io/etcd/embed/doc.go b/vendor/go.etcd.io/etcd/embed/doc.go
index 4811bb6..c555aa5 100644
--- a/vendor/go.etcd.io/etcd/embed/doc.go
+++ b/vendor/go.etcd.io/etcd/embed/doc.go
@@ -21,7 +21,7 @@
 		"log"
 		"time"
 
-		"go.etcd.io/etcd/embed"
+		"github.com/coreos/etcd/embed"
 	)
 
 	func main() {