remove NetworkUtil.create_node_network(network_map), not needed anymore
remove get_platform_attributes operation from RSN OMS–CI interface
mark test_platform_instrument as obsolete (with a skip): this will need a good revision after several recent changes including configuration handling for platforms
more clean-up and alignment regarding RSN OMS - CI interface, and platform driver interface
minor update to oms_simple program (basically to only try read-only operations) for eventual re-enablement
Merge pull request #2166 from carueda/pa_driver_oms_cleanup_and_alignment

More clean-up (simplification!) and alignment platform driver and RSN CI-OMS interface