This patch sets URL to glance worker.
If this is set, other glance workers will know how to contact this one
directly if needed. For image import, a single worker stages the image
and other workers need to be able to proxy the import request to the
right one.
With current setup glance image import just not working.
Closes-Bug: #2048525
Change-Id: I4246dc8a80038358cd5b6e44e991b3e2ed72be0e
(cherry picked from commit 9ecfcf5a17548056eacfa9ba90fc07acb00e64b7)
131296825a