support installing django_openstack_auth from pypi

Part of the libs from pypi conversion, convert django_openstack_auth
to this format.

Change-Id: I97c8ea19d8aed1e0bdd62c06cfadd1d616573d76
move keystonemiddleware to pypi libs

Make keystonemiddleware install from pypi releases by default

Change-Id: I3dc4b096b4184f4cf00fb0df66b76fcc8f19785b
Merge "support installing django_openstack_auth from pypi"
Merge "move keystonemiddleware to pypi libs"