try to create mistral client without auth_url

Change-Id: Ia090c9018a8b1cf51d0448ec2fe525cdf9b4ed9a

requirements.txt

@@ -14,6 +14,7 @@ python-keystoneclient>=3.8.0 # Apache-2.0
 python-neutronclient>=6.7.0 # Apache-2.0
 python-novaclient>=9.1.0 # Apache-2.0
 python-heatclient>=1.10.0 # Apache-2.0
+python-mistralclient>=3.1.0,!=3.2.0  # Apache-2.0
 pyzabbix>=0.7.4 # LGPL
 networkx<2.0,>=1.10 # BSD
 oslo.config>=5.1.0 # Apache-2.0

vitrage/os_clients.py

@@ -146,12 +146,10 @@ def heat_client(conf):
 
 def mistral_client(conf):
     """Get an instance of Mistral client"""
-    auth_config = conf.service_credentials
     try:
         mi_client = driver_module('mistral')
         client = mi_client.Client(
             session=keystone_client.get_session(conf),
-            auth_url=auth_config.auth_url
         )
         LOG.info('Mistral client created')
         return client