Add RBAC tests for namespace_tags_client.

Adds RBAC tests for all the endpoints in namespace_tags_client
except for

  1) delete_namespace_tag
  2) delete_namespace_tags

because Glance does not currently do policy enforcement for them [0]
(the policy actions are even missing from the policy.json).

This patch also removes invalid occurrences of CONF and LOG
throughout Patrole image tests, and renames a few incorrectly
named image test files.

Partially-Implements blueprint: initial-tests-image

[0] https://github.com/openstack/glance/blob/master/etc/policy.json

Change-Id: I15be44d50886b8f500d640b67563504287767d91
7 files changed