Updated openstack/openstack
Project: openstack/python-neutronclient  3a25ff3b3d35df38e00fcad4c12e3df06d69985a

Switch over to mox3

mox3 is a Python 3.x compatible drop-in and allows
to continue with the porting effort to Python 3.x with
minimal code changes.

Closes-Bug: #1283482
Change-Id: Ib052f1b87e312481e4c7c8d775ece94f53e7106b