RBC regression test script providing failure details. This has been derived from rbc_product_config.sh with several improvements: * the name reflects its function * when comparison fails, shows failure details * runs the test for all the configurations regardless of failures The old rbc_product_config.sh now redirects to the new one. Test: presubmits Change-Id: I3563d7181b7ab8881d39940e8a78478c54f3670d