Updated openstack/openstack
Project: openstack/oslo-incubator  12a5d1236a05695e07d7419076b977ad529a122f

Remove middleware

Now that we released oslo.middleware, we can safely remove all of this
code!

Closes-Bug: #1371701

Change-Id: If2afaccd91ae1f4bc4b9002b31efb3b432c7c605