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
Import httplib from six.moves

Partial implement: blueprint py33-support

Change-Id: I4e2a7020c726717fa1e28926a04d97066bdf79ec