release: Add tests for tag_repos.sh

- Add tests for release tool tag_repos.sh
- Toplevel makefile
- Add make test target for CI

Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>

release/tag_repos_test.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+#
+# Copyright (c) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+echo "Check tag_repos.sh show help"
+./release/tag_repos.sh  | grep Usage
+
+echo "Check tag_repos.sh -h option"
+./release/tag_repos.sh  -h | grep Usage
+
+echo "Check tag_repos.sh status"
+./release/tag_repos.sh status | grep runtime
+
+echo "Check tag_repos.sh create tags but not push"
+./release/tag_repos.sh tag | grep "tags not pushed"