Move back to mod_wsgi for devstack
Move back to mod_wsgi for devstack

There is an issue with the unauthed tests
and uwsgi causing the CI to frequently fail.
Lets move back to mod_wsgi until we can figure
that out.

Change-Id: I9fd558cec85da87c8daea36f7a9e2666948e72f1

openstack/designate,openstack/designate,openstack/designate