Update to use static upper-constraints URL
Update to use static upper-constraints URL

There is a new upper-constraints URL to use that will make it easier to
handle when new stable branches are created. All projects should now be
updated to use these new static URLs hosted on releases.openstack.org.

Change-Id: I9e999382493c5e491fff9e003e68746b7e8302aa
Signed-off-by: Sean McGinnis <961eeb09b6d45516665e15b82e013282c4faf575@gmail.com>

openstack/python-brick-cinderclient-ext,openstack/python-brick-cinderclient-ext