RFR(M): 8189102: All tools should support -?, -h and --help

[Lindenmaier, Goetz]

Hi

The tools in jdk should all show the same behavior wrt. help flags. 
This change normalizes the help flags of a row of the tools in the jdk.
Java accepts -?, -h and --help, thus I changed the tools to support
these, too.  Some tools exited with '1' after displaying the help message, 
I turned this to '0'. 

Maybe this is not the right mailing list for this, please advise.

Please review this change. I please need a sponsor.
http://cr.openjdk.java.net/~goetz/wr17/8189102-helpMessage/webrev.01/

In detail, this fixes the help message of the following tools:
jar          -? -h --help;  added -?.
jarsigner    -? -h --help;  added --help. -help accepted but not documented.
javac        -?    --help;  added -?. Removed -help. -h is taken for other purpose
javadoc      -? -h --help;  added -h -?. Removed -help
javap        -? -h --help;  added -h. -help accepted but no more documented.
jcmd         -? -h --help;  added -? --help. -help accepted but no more documented. Changed return value to '0'
jdb          -? -h --help;  added -? -h --help. -help accepted but no more documented.
jdeprscan    -? -h --help;  added -?
jinfo        -? -h --help;  added -? --help. -help accepted but no more documented.
jjs             -h --help;  Replaced -help by --help. Adding more not straight forward.
jps          -? -h --help;  added -? --help. -help accepted but no more documented.
jshell       -? -h --help;  added -?
jstat        -? -h --help;  added -h --help. -help accepted but no more documented.

Best regards,
  Goetz.