The Identity functional tests had an assumption that OS_AUTH_URL would
always be present, but when running the functional tests and only setting
OS_CLOUD (using clouds.yaml for creds) this fell down.

Change-Id: Ie589d301f866b06d9f8be8deeb953e03bc01cf09

whenever a resource adds a field (which is allowed in our API
guidelines), OSC functional tests fail, because we validate
the resource keys to a hardcoded list.

instead, this change proposes that the logic of
assert_show_fields is flipped around, so our hardcoded list acts
as a minimum set of values that must appear in the resource.

as part of this change, some fields were remove from the constants
since they were not actually in the returned data.

also, delete unused code `assert_show_structure`.

Change-Id: I8c0f0e80ea472f9c7f93c5f1f0ae52048e6cd7da

commit Id18b8b2fe853b97631bc990df8188ed64a6e1275 added domain IDs
to an Identity provider, our functional tests have a hard match
on what to expect when 'showing' an idp, the domain ID was missing.

Change-Id: I87a1fd762918551c533668a9aa94f7c6268b79d6

the gate is super wedged, i will skip tests and unskip them
as necessary.

Change-Id: Ia4469738c876ec1293f91b96dcc7d15365f4f37d

we can use assertGreater(a,b) to replace assertTrue(a>b)

Change-Id: Idd92a99bf5fd25785a47645d46bcfcad23ed870a

functional tests should be grouped with other tests (unit and
integration tests). as part of this commit the "common" module
was renamed to just "base", this was done for simplicity.

the post_test_hook.sh file was also copied to the functional module
since it should live there. a separate change to the infra repo
will be made to call the new location, once that is merged we
can remove the old one (a new change will also be posted for that)

Needed-By: I49d54f009021d65c1ae49faf6b3f0a7acdadd7b3
Change-Id: Ie8c334f6223373b8e06df8bd8466500d2a2c8ede