Updated openstack/openstack
Project: openstack-dev/devstack  1821200bc50ae524bb4da7c555078206ced6396c

Add oslo.concurrency and oslo.middleware

Install the oslo.concurrency and oslo.middleware libraries from source so
the gate tests are run against master.

Change-Id: I194fc160127ab8b4b7d0086586d8ba7f92c67076