Switch to oslo_log

Change-Id: Id9ce71a53f4392ea1bd408681d01b6174d86ae61
diff --git a/patrole_tempest_plugin/rbac_utils.py b/patrole_tempest_plugin/rbac_utils.py
index 7792cbd..1150416 100644
--- a/patrole_tempest_plugin/rbac_utils.py
+++ b/patrole_tempest_plugin/rbac_utils.py
@@ -14,11 +14,11 @@
 #    under the License.
 
 import json
-import logging
 import six
 import time
 import urllib3
 
+from oslo_log import log as logging
 from tempest import config
 
 from patrole_tempest_plugin import rbac_exceptions as rbac_exc