Support nova client micro versions

Support micro versions when requesting a nova client.

unit_tests/utilities/test_zaza_utilities_openstack.py

@@ -289,6 +289,15 @@ class TestOpenStackUtils(ut_utils.BaseTestCase):
         openstack_utils.get_undercloud_keystone_session()
         self.get_keystone_session.assert_called_once_with(_auth, verify=None)
 
+    def test_get_nova_session_client(self):
+        session_mock = mock.MagicMock()
+        self.patch_object(openstack_utils.novaclient_client, "Client")
+        openstack_utils.get_nova_session_client(session_mock)
+        self.Client.assert_called_once_with(2, session=session_mock)
+        self.Client.reset_mock()
+        openstack_utils.get_nova_session_client(session_mock, version=2.56)
+        self.Client.assert_called_once_with(2.56, session=session_mock)
+
     def test_get_urllib_opener(self):
         self.patch_object(openstack_utils.urllib.request, "ProxyHandler")
         self.patch_object(openstack_utils.urllib.request, "HTTPHandler")

zaza/openstack/utilities/openstack.py

@@ -253,15 +253,18 @@ def get_designate_session_client(**kwargs):
                            **kwargs)
 
 
-def get_nova_session_client(session):
+def get_nova_session_client(session, version=None):
     """Return novaclient authenticated by keystone session.
 
     :param session: Keystone session object
     :type session: keystoneauth1.session.Session object
+    :param version: Version of client to request.
+    :type version: float
     :returns: Authenticated novaclient
     :rtype: novaclient.Client object
     """
-    return novaclient_client.Client(2, session=session)
+    version = version or 2
+    return novaclient_client.Client(version, session=session)
 
 
 def get_neutron_session_client(session):