Add Placement helper

This patch added Placement to Watcher
We plan to improve the data model and strategies in
the future specs.

Change-Id: I7141459eef66557cd5d525b5887bd2a381cdac3f
Implements: blueprint support-placement-api

watcher/conf/__init__.py

@@ -37,6 +37,7 @@ from watcher.conf import monasca_client
 from watcher.conf import neutron_client
 from watcher.conf import nova_client
 from watcher.conf import paths
+from watcher.conf import placement_client
 from watcher.conf import planner
 from watcher.conf import service
 
@@ -62,3 +63,4 @@ neutron_client.register_opts(CONF)
 clients_auth.register_opts(CONF)
 ironic_client.register_opts(CONF)
 collector.register_opts(CONF)
+placement_client.register_opts(CONF)

watcher/conf/placement_client.py

@@ -0,0 +1,41 @@
+#    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
+
+
+placement_group = cfg.OptGroup(
+    'placement_client',
+    title='Placement Service Options',
+    help="Configuration options for connecting to the placement API service")
+
+placement_opts = [
+    cfg.StrOpt('api_version',
+               default='1.29',
+               help='microversion of placement API when using '
+                    'placement service.'),
+    cfg.StrOpt('interface',
+               default='public',
+               choices=['internal', 'public', 'admin'],
+               help='Type of endpoint when using placement service.'),
+    cfg.StrOpt('region_name',
+               help='Region in Identity service catalog to use for '
+                    'communication with the OpenStack service.')]
+
+
+def register_opts(conf):
+    conf.register_group(placement_group)
+    conf.register_opts(placement_opts, group=placement_group)
+
+
+def list_opts():
+    return [(placement_group.name, placement_opts)]