[CI] Add no-tls-proxy job

Some gates run devstack like this and it follows different code
paths.
Let's ensure we don't break it now and then.

Change-Id: I6ee1bfc30bced53f6d7fb841e01714069919fd88
Reference: http://lists.openstack.org/pipermail/openstack-discuss/2020-July/015997.html
Reference: http://eavesdrop.openstack.org/meetings/qa/2021/qa.2021-05-11-14.00.log.html
1 file changed