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

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/go.etcd.io/etcd/NOTICE b/vendor/go.etcd.io/etcd/NOTICE
new file mode 100644
index 0000000..b39ddfa
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/NOTICE
@@ -0,0 +1,5 @@
+CoreOS Project
+Copyright 2014 CoreOS, Inc
+
+This product includes software developed at CoreOS, Inc.
+(http://www.coreos.com/).