Re-package grpc and protobuf with the right group id and version

Change-Id: Ib1a17d917a061d3cce32eed3e72b18c596ccff69
diff --git a/tools/build/bazel/variables.bzl b/tools/build/bazel/variables.bzl
index 943c1d0..90a7479 100644
--- a/tools/build/bazel/variables.bzl
+++ b/tools/build/bazel/variables.bzl
@@ -4,3 +4,6 @@
 ONOS_ORIGIN = "ONOS Community"
 APP_PREFIX = ONOS_GROUP_ID + "."
 DEFAULT_APP_CATEGORY = "Utility"
+
+GRPC_JAVA_VERSION = "1.18.0"
+PROTOBUF_VERSION = "3.6.1.3"