Updated openstack/openstack
Project: openstack/trove  dd664a6ea399983a9b0489aae0245b9de6271d3a

switch from mox to mox3

Mox3 is an unofficial port of the Google mox framework to Python 3.

Closes-bug: 1283482
Change-Id: I3f558420bc720880eb91fca7b936bdcd6949a513