Replace mox with mox3

Mox3 is an unofficial port of the Google mox framework
(http://code.google.com/p/pymox/) to Python 3.
https://pypi.python.org/pypi/mox3

Align with global-requirement and update the importing clause.

Partial implement: blueprint py33-support

Change-Id: I5d46d30b72b8504977d8d1891b3b0c81714e9099

heatclient/tests/test_common_http.py

@@ -11,12 +11,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import mox
 import testtools
 
 from heatclient.common import http
 from heatclient import exc
 from heatclient.tests import fakes
+from mox3 import mox
 
 
 class HttpClientTest(testtools.TestCase):

heatclient/tests/test_shell.py

@@ -20,11 +20,12 @@ import urllib2
 import yaml
 
 import fixtures
-import mox
 import tempfile
 import testscenarios
 import testtools
 
+from mox3 import mox
+
 try:
     import json
 except ImportError:

test-requirements.txt

@@ -8,6 +8,7 @@ discover
 fixtures>=0.3.14
 mock>=1.0
 mox>=0.5.3
+mox3>=0.7.0
 sphinx>=1.1.2
 testscenarios>=0.4
 testrepository>=0.0.17