Filter out implied roles

This filters out the irrelevant implied roles, so we only consider the
ones that are actually used in the test. This gives us a more strict and
correct test, which also works when we have the new default rules that
come from the basic-default-roles blueprint.

Change-Id: I4827be8e62b57b1def420e66bed1a95af7bc8007
Needed-By: https://review.openstack.org/#/c/572243/
1 file changed