Updated openstack/openstack
Project: openstack/taskflow  45ba27ed1a2d9350ed938fa60a7ad36ca1229ef1

We can now use PyMySQL in py3.x tests

The requirement for PyMySQL got merged into the requirements
repo, so now instead of just testing sqlite (or postgres) in py3.x
we can now test against the mysql instance that should exist in the
test environments (just like we test with MySQL-python in py2.x).

Change-Id: I6e48df78d20389d65de8210c6157abb99f52d7dd