Use py3kcompat.urlutils from oslo instead of six.urllib_parse

Six before 1.4.0 does not provide urllib_parse module, so we need
another solution.

Closes-bug: #1240827
Change-Id: I6b49b80b94028e01da0e3c4930f3e97cd32f73d0

taskflow/persistence/backends/__init__.py

@@ -17,10 +17,10 @@
 #    under the License.
 
 import logging
-from six.moves import urllib_parse as urlparse  # noqa
 from stevedore import driver
 
 from taskflow import exceptions as exc
+from taskflow.openstack.common.py3kcompat import urlutils
 
 
 # NOTE(harlowja): this is the entrypoint namespace, not the module namespace.
@@ -30,7 +30,7 @@ LOG = logging.getLogger(__name__)
 
 
 def fetch(conf, namespace=BACKEND_NAMESPACE):
-    backend_name = urlparse.urlparse(conf['connection']).scheme
+    backend_name = urlutils.urlparse(conf['connection']).scheme
     LOG.debug('Looking for %r backend driver in %r', backend_name, namespace)
     try:
         mgr = driver.DriverManager(namespace, backend_name,