Add Gnocchi datasource

This patch set adds Gnocchi datasource support

Implements: blueprint gnocchi-watcher

Change-Id: I41653149435fd355548071de855586004371c4fc

watcher/conf/gnocchi_client.py

@@ -0,0 +1,42 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2017 Servionica
+#
+# Authors: Alexander Chadin <a.chadin@servionica.ru>
+#
+# 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
+
+gnocchi_client = cfg.OptGroup(name='gnocchi_client',
+                              title='Configuration Options for Gnocchi')
+
+GNOCCHI_CLIENT_OPTS = [
+    cfg.StrOpt('api_version',
+               default='1',
+               help='Version of Gnocchi API to use in gnocchiclient.'),
+    cfg.IntOpt('query_max_retries',
+               default=10,
+               help='How many times Watcher is trying to query again'),
+    cfg.IntOpt('query_timeout',
+               default=1,
+               help='How many seconds Watcher should wait to do query again')]
+
+
+def register_opts(conf):
+    conf.register_group(gnocchi_client)
+    conf.register_opts(GNOCCHI_CLIENT_OPTS, group=gnocchi_client)
+
+
+def list_opts():
+    return [('gnocchi_client', GNOCCHI_CLIENT_OPTS)]