VOL-2006 update voltha-api-server to use go mod

Change-Id: Ic9cce461175dd08cc4f30ddda2172640e8928b00
diff --git a/internal/pkg/afrouter/round-robin-router_test.go b/internal/pkg/afrouter/round-robin-router_test.go
index f9bed07..5d8331e 100644
--- a/internal/pkg/afrouter/round-robin-router_test.go
+++ b/internal/pkg/afrouter/round-robin-router_test.go
@@ -27,7 +27,7 @@
 )
 
 const (
-	ROUND_ROBIN_ROUTER_PROTOFILE = "../../../vendor/github.com/opencord/voltha-protos/go/voltha.pb"
+	ROUND_ROBIN_ROUTER_PROTOFILE = "../../../vendor/github.com/opencord/voltha-protos/voltha.pb"
 )
 
 func init() {