Enhance test to rescope token using v2

There was a problem in Keystone recently where revoking a token
derived from another token caused the original token to be
revoked, so adding a test here to validate it continues to work
as expected.

Change-Id: I4b6a1440b661c075793e73edc52b4a5919d93d71
orchestration remove unused invalid_template_url

Remove invalid_template_url from test_templates API tests, as it's
unused and appears to be a cut/paste artefact from copying the
negative test.

Change-Id: I0166bd361ed51a2be23f55e5b4426834ce173a31
Merge "orchestration remove unused invalid_template_url"
Merge "Enhance test to rescope token using v2"