Add tempest plugin

This patch set adds tempest plugin to register existing tempest
tests of watcherclient. It is also required to let devstack-tempest
job to launch watcherclient functional tests.

Change-Id: I4d906fd597048bb37803a2bb42f8357502cf1b76

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=${OS_TEST_PATH:-./watcherclient/tests/functional}
+top_dir=./

setup.cfg

@@ -25,6 +25,8 @@ packages =
 [entry_points]
 console_scripts =
     watcher = watcherclient.shell:main
+tempest.test_plugins =
+    watcherclient_tests = watcherclient.tests.functional.plugin:WatcherClientTempestPlugin
 
 openstack.cli.extension =
     infra_optim = watcherclient.osc.plugin

watcherclient/tests/functional/config.py

@@ -0,0 +1,23 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2018 Servionica
+#
+# 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.
+
+from oslo_config import cfg
+
+
+service_option = cfg.BoolOpt("watcher_client",
+                             default=True,
+                             help="Whether or not watcher_client is expected"
+                                  "to be available")

watcherclient/tests/functional/plugin.py

@@ -0,0 +1,34 @@
+# 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.
+
+
+import os
+
+from tempest.test_discover import plugins
+
+from watcherclient.tests.functional import config as watcher_config
+
+
+class WatcherClientTempestPlugin(plugins.TempestPlugin):
+    def load_tests(self):
+        base_path = os.path.split(os.path.dirname(
+            os.path.abspath(__file__)))[0]
+        test_dir = "watcherclient/tests/functional"
+        full_test_dir = os.path.join(base_path, test_dir)
+        return full_test_dir, base_path
+
+    def register_opts(self, conf):
+        conf.register_opt(watcher_config.service_option,
+                          group='service_available')
+
+    def get_opt_lists(self):
+        return [('service_available', [watcher_config.service_option])]