Updated openstack/openstack
Project: openstack/keystone  03f5d56a2a6d10e11675796b9dc4a0d60751556f

Remove S3 middleware tests from tox.ini

The middleware was moved to the keystonemiddleware project and no longer
needs to be tested here.

Change-Id: Ic4ac0d2558ced56eeadd6241159188c49fcceb6e