RFR: 8027765 Make exit codes and stdout/stderr printing from jmap/jinfo/jstack/jps consistent

[Staffan Larsen]

The contract for the tools should be (similarly from other tools, eg javac):

If the arguments are wrong or not specified: exit code != 0, usage output on stderr
If -help or -h is specified: exit code == 0, usage output on stderr

webrev: http://cr.openjdk.java.net/~sla/8027765/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8027765

Thanks,
/Staffan
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