use System.err and System.out to print exit messages on CliPeon

[clintropolis]

CliPeon attempts to log stuff after the log module has been stopped, which does not work. This switches these messages to directly use System.out and System.err so at least the messages go somewhere.

End of task if an error occurs after stopping will appear as:

org.apache.druid.initialization.Log4jShutterDownerModule$Log4jShutterDowner.stop()] on object[org.apache.druid.initialization.Log4jShutterDownerModule$Log4jShutterDowner@7237f3c1].
Error!
java.lang.Exception: Oh noes, I wrecked yer peon after logger shutdown!
	at org.apache.druid.cli.CliPeon.run(CliPeon.java:382)
	at org.apache.druid.cli.Main.main(Main.java:118)

instead of the exception being eaten and nothing printed.

This will make it more obvious why a task might report SUCCESS in task logs in terms of completion of the indexing job, but show as FAILED overall.

[asdf2014]

LGTM