multinode: Add Shipyard test site stage

This change adds a script that enables the ability to add a site test
stage to a manifest. The Shipyard test site action runs Helm tests for a
deployed site.

Change-Id: I77c123c89fe1e780ede899fa3cc6d2a726f74f49

tools/multi_nodes_gate/airship_gate/stages/shipyard-test-site.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Copyright 2019, AT&T Intellectual Property
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+source "${GATE_UTILS}"
+
+cd "${TEMP_DIR}"
+
+shipyard_cmd create action test_site "$@"