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

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/gopkg.in/yaml.v3/go.mod b/vendor/gopkg.in/yaml.v3/go.mod
new file mode 100644
index 0000000..f407ea3
--- /dev/null
+++ b/vendor/gopkg.in/yaml.v3/go.mod
@@ -0,0 +1,5 @@
+module "gopkg.in/yaml.v3"
+
+require (
+	"gopkg.in/check.v1" v0.0.0-20161208181325-20d25e280405
+)