YARN-679 test that a non-conf XML file triggers a meaningful failure message in CLI parse, not some XML parser stack elsewhere
YARN-679 make code to generate a startup/shutdown string public
YARN-679 javadocs -including package
YARN-679 javadocs -including package
YARN-679 conf arg -> "-conf"; same as for generic options
YARN-679 test regression; fixed
YARN-679 javadocs