CIMI tests (system1_test): fix typo in XML
CIMI tests: set last_response every time we retrieve an object

This measn that lastr_response is also set by fetch
CIMI tests (test_helper): make poll_state work for both machines and systems

Any model that has a state can now be used with poll_state
CIMI tests (system1_test): less noisy output; small simplification
CIMI tests: make cimi system scenario more generic and work on fgcp