python3: fix imports compatibility

Python3 reorganized the standard library and moved several functions
to different modules. Six provides a consistent interface
to them through the fake six.moves module.

However, the urlparse, urllib2, etc modules have been combined
into one module which Six does not support so do it the old
fashioned way.

Change-Id: Ieb7cc7ee2a4a97807873cfe2fc3fa0a5cf3c3980
Signed-off-by: Chuck Short <chuck.short@canonical.com>

cinderclient/client.py

@@ -21,7 +21,12 @@ OpenStack Client interface. Handles the REST calls and responses.
 
 import logging
 import os
-import urlparse
+
+try:
+    import urlparse
+except ImportError:
+    import urllib.parse as urlparse
+
 try:
     from eventlet import sleep
 except ImportError:

cinderclient/tests/test_shell.py

@@ -1,8 +1,8 @@
-import cStringIO
 import re
 import sys
 
 import fixtures
+from six import moves
 from testtools import matchers
 
 from cinderclient import exceptions
@@ -29,7 +29,7 @@ class ShellTest(utils.TestCase):
     def shell(self, argstr):
         orig = sys.stdout
         try:
-            sys.stdout = cStringIO.StringIO()
+            sys.stdout = moves.StringIO()
             _shell = cinderclient.shell.OpenStackCinderShell()
             _shell.main(argstr.split())
         except SystemExit:

cinderclient/tests/test_utils.py

@@ -1,7 +1,8 @@
 import collections
-import StringIO
 import sys
 
+from six import moves
+
 from cinderclient import exceptions
 from cinderclient import utils
 from cinderclient import base
@@ -82,7 +83,7 @@ class CaptureStdout(object):
     """Context manager for capturing stdout from statments in its's block."""
     def __enter__(self):
         self.real_stdout = sys.stdout
-        self.stringio = StringIO.StringIO()
+        self.stringio = moves.StringIO()
         sys.stdout = self.stringio
         return self
 

cinderclient/tests/v1/fakes.py

@@ -13,7 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import urlparse
+try:
+    import urlparse
+except ImportError:
+    import urllib.parse as urlparse
 
 from cinderclient import client as base_client
 from cinderclient.tests import fakes

cinderclient/tests/v2/fakes.py

@@ -12,7 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import urlparse
+try:
+    import urlparse
+except ImportError:
+    import urllib.parse as urlparse
 
 from cinderclient import client as base_client
 from cinderclient.tests import fakes