Add support for overriding mistral service type

The mistral team copied the heinous pervsion that the cinder team
propagated upon the world and appended a version to their service_type.
That's ok - there is nice copy-pastable code here we can use to prevent
users from feeling the pain.

Change-Id: Icf280f932014e4d9abeab3e944aece125988562e

os_client_config/cloud_config.py

@@ -161,11 +161,15 @@ class CloudConfig(object):
         # Of course, if the user requests a volumev2, that structure should
         # still work.
         # What's even more amazing is that they did it AGAIN with cinder v3
+        # And then I learned that mistral copied it.
         if service_type == 'volume':
             if self.get_api_version(service_type).startswith('2'):
                 service_type = 'volumev2'
             elif self.get_api_version(service_type).startswith('3'):
                 service_type = 'volumev3'
+        elif service_type == 'workflow':
+            if self.get_api_version(service_type).startswith('2'):
+                service_type = 'workflowv2'
         return self.config.get(key, service_type)
 
     def get_service_name(self, service_type):

os_client_config/defaults.json

@@ -22,5 +22,6 @@
   "orchestration_api_version": "1",
   "secgroup_source": "neutron",
   "status": "active",
-  "volume_api_version": "2"
+  "volume_api_version": "2",
+  "workflow_api_version": "2"
 }

os_client_config/tests/test_cloud_config.py

@@ -163,6 +163,11 @@ class TestCloudConfig(base.TestCase):
         cc.config['volume_api_version'] = '3'
         self.assertEqual('volumev3', cc.get_service_type('volume'))
 
+    def test_workflow_override_v2(self):
+        cc = cloud_config.CloudConfig("test1", "region-al", fake_services_dict)
+        cc.config['workflow_api_version'] = '2'
+        self.assertEqual('workflowv2', cc.get_service_type('workflow'))
+
     def test_get_session_no_auth(self):
         config_dict = defaults.get_defaults()
         config_dict.update(fake_services_dict)