Updated openstack/openstack
Project: openstack/python-glanceclient  e4d1961c926b425e93fa2d8bdd37e5c1f19d574b
null
python3: Switch to mox3 instead of mox

In order to transition to a python 3.x compatible world,
lets switch to mox3 which is python 3.x compatible drop-in
replacement of mox.

Change-Id: Id971475f0e92900689d6784ffc55ae5fe63d9fe4