Migrate metadata rate limiting tests

Main changes from original tests:
- Made alternative 'is_service_on_node' base method instead
  of helper plugin 'get_nodes_info_by_name' use.
- Configuration restored in between tests using permissive values due
  to 'oc patch' inability to remove configuration in podified.
- Feature disabled using configuration when all tests finished
  for same reason of inability to remove configuration.
- Podman inspect health/healthcheck json output inconsistent
  in podified/tripleo envs, also not supported in devstack,
  systemctl is-active used instead.
- Most methods made to depend on '_set_rate_limiting_config',
  difference between podified/devstack handled there.
- Metadata configuration file according to OSP type (devstack/other).
- Adjust migrated imports and configuration.
- Replaced test UUIDs with unique ones.

Change-Id: Ia17be6044eb88b00568f469c8ff5ebb98dba6559