VOL-2056 Unit tests cannot be run while kind-voltha is running

Change-Id: I658636703abd93e6df04328bb09c57a6ba40bf00
diff --git a/go.mod b/go.mod
index a1f20b2..38ab5e8 100644
--- a/go.mod
+++ b/go.mod
@@ -16,6 +16,7 @@
 	github.com/onsi/gomega v1.7.0 // indirect
 	github.com/opencord/voltha-go v2.2.0+incompatible
 	github.com/opencord/voltha-protos v1.0.3
+	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
 	github.com/pkg/errors v0.8.1 // indirect
 	github.com/spf13/pflag v1.0.3 // indirect
 	github.com/stretchr/testify v1.3.0