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

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/github.com/jcmturner/dnsutils/v2/go.mod b/vendor/github.com/jcmturner/dnsutils/v2/go.mod
new file mode 100644
index 0000000..f75ac6d
--- /dev/null
+++ b/vendor/github.com/jcmturner/dnsutils/v2/go.mod
@@ -0,0 +1,5 @@
+module github.com/jcmturner/dnsutils/v2
+
+go 1.13
+
+require github.com/stretchr/testify v1.4.0