Keep py3.X compatibility for urllib

Use six.moves.urllib.parse instead of urllib.
For urllib2 compatibility, it need to sync policy
module from oslo first. Then six.moves.urllib.request
can replace urllib2.

Change-Id: Ia351cd3088dd64fd8c8ce4ca8b9a5889c574888e
Partial-Bug: #1280105

cinderclient/client.py

@@ -43,10 +43,7 @@ from oslo_utils import strutils
 
 osprofiler_web = importutils.try_import("osprofiler.web")
 
-try:
-    import urlparse
-except ImportError:
-    import urllib.parse as urlparse
+import six.moves.urllib.parse as urlparse
 
 try:
     from eventlet import sleep

cinderclient/tests/unit/v1/fakes.py

@@ -15,10 +15,7 @@
 
 from datetime import datetime
 
-try:
-    import urlparse
-except ImportError:
-    import urllib.parse as urlparse
+import six.moves.urllib.parse as urlparse
 
 from cinderclient import client as base_client
 from cinderclient.tests.unit import fakes

cinderclient/tests/unit/v2/fakes.py

@@ -14,10 +14,7 @@
 
 from datetime import datetime
 
-try:
-    import urlparse
-except ImportError:
-    import urllib.parse as urlparse
+import six.moves.urllib.parse as urlparse
 
 from cinderclient import client as base_client
 from cinderclient.tests.unit import fakes