gRPC migration update

Change-Id: Icdd1a824948fa994cd36bd121c962f5ecf74e3cf
diff --git a/vendor/go.uber.org/multierr/go.mod b/vendor/go.uber.org/multierr/go.mod
new file mode 100644
index 0000000..ff8bdf9
--- /dev/null
+++ b/vendor/go.uber.org/multierr/go.mod
@@ -0,0 +1,8 @@
+module go.uber.org/multierr
+
+go 1.12
+
+require (
+	github.com/stretchr/testify v1.3.0
+	go.uber.org/atomic v1.7.0
+)