Fix gate for handling of deprecated rules and image client

oslo.policy has made the changes to not modify the
rule check
- https://review.opendev.org/c/openstack/oslo.policy/+/774112

Patrole code for handling the deprecated code needs to make
changes to work with latest oslo policy.

Also fix the image namespace clients to be admin which were
recently changed in Tempest side
- https://review.opendev.org/c/openstack/tempest/+/780108

Change-Id: I93d74d71a3e085ab4f08053db83354e86f3f2d14
2 files changed