Add Watcher client support

Add get_watcher_session_client() helper function to build a
watcherclient.v1.Client instance authenticated with a keystone session
that uses admin credentials by default.

requirements.txt

@@ -49,6 +49,7 @@ python-neutronclient
 python-novaclient
 python-octaviaclient
 python-swiftclient
+python-watcherclient
 tenacity
 paramiko
 

setup.py

@@ -65,6 +65,7 @@ install_require = [
     'python-ceilometerclient',
     'python-cinderclient<6.0.0',
     'python-swiftclient<3.9.0',
+    'python-watcherclient',
     # 'zaza@git+https://github.com/openstack-charmers/zaza.git#egg=zaza',
     'zaza',
 ]

zaza/openstack/utilities/openstack.py

@@ -65,6 +65,7 @@ from keystoneauth1.identity import (
     v3,
     v2,
 )
+from watcherclient import client as watcher_client
 import zaza.openstack.utilities.cert as cert
 import zaza.utilities.deployment_env as deployment_env
 import zaza.utilities.juju as juju_utils
@@ -516,6 +517,15 @@ def get_manila_session_client(session, version='2'):
     return manilaclient.Client(session=session, client_version=version)
 
 
+def get_watcher_session_client(session):
+    """Return Watcher client authenticated by keystone session.
+
+    :param session: Keystone session object
+    :returns: Authenticated watcher client
+    """
+    return watcher_client.get_client(session=session, api_version='1')
+
+
 def get_keystone_scope(model_name=None):
     """Return Keystone scope based on OpenStack release of the overcloud.