Based on our analysis [1], there were several identity tests
available which weren't included in any interop guideline.
This commit adds those tests under a few new capabilities which
are added as advisory for now. They will be moved to required
after one cycle being under advisory.
[1] https://etherpad.opendev.org/p/refstack-test-analysis
Change-Id: I38e7860245470689aad6f9d79bbcb7b8528b48f7
52d090ccd6