Fix test suite bug with barbican client

Barbican python client has implemented new methods in 5.5.0
which requires call to barbican API to create client.
There are no way for now to really get a fake barbican client.
Mocking the method responsible of that call in the tests
so it doesn't need to make the API call.

Change-Id: I6a607c8941bdb219de1cc212403124dea8ccac23

mistral_extra/tests/unit/actions/openstack/test_generator.py

@@ -24,6 +24,9 @@ from mistral_extra import config
 
 from mistral_extra.tests.unit import base
 
+import barbicanclient.v1.client as barbicanclient_test
+from unittest import mock
+
 ABSOLUTE_TEST_MAPPING_PATH = os.path.realpath(
     os.path.join(os.path.dirname(__file__),
                  "../../../resources/openstack/test_mapping.json")
@@ -87,6 +90,11 @@ class GeneratorTest(base.BaseTest):
             actions.ZunAction, "get_fake_client_method",
             return_value=lambda x: None))
 
+    @mock.patch.object(
+        barbicanclient_test.Client,
+        '_get_max_supported_version',
+        mock.Mock(return_value="1.1")
+    )
     def test_generator(self):
         for generator_cls in generator_factory.all_generators():
             action_classes = generator_cls.create_actions()