RFR(xxxs): 8203014: jcmd should output command list if no command is given

[Thomas Stüfe]

Hi,

may I have reviews for this very small improvement?

Bug: https://bugs.openjdk.java.net/browse/JDK-8203014
Webrev: http://cr.openjdk.java.net/~stuefe/webrevs/8203014-jcmd-list-commands-if-no-command-given/webrev.00/webrev/

When jcmd is invoked with valid target VM id(s) but without command,
the generic help text is output. It would be more convenient if the
target VM would output a list of available commands.

In other words, "jcmd <target vm>" should behave like "jcmd <target vm> help".

Thanks, Thomas