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

[Robert Field]

JShell changes —

The code change is fine.

The help change in the properties file is not consistent with the other items, note:        --help-extra, -X      Print help on…
      so this should be:      —help, -h, -?
Or, if there is a tool-wide standard, then the —help-extra entry should be changed.

The tests of “—help” should be updated to include the now documented “-h” and “-?”

As Jon noted, the _ja and _zh_CN properties should not be touched.

-Robert

> On Nov 17, 2017, at 3:23 AM, Lindenmaier, Goetz <goetz.lindenmaier at sap.com> wrote:
> 
> Hi,
> 
> please review this change. I also filed a CSR for this:
> http://cr.openjdk.java.net/~goetz/wr17/8189102-helpMessage/webrev.02/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8189102
> CSR: https://bugs.openjdk.java.net/browse/JDK-8191477
> 
> See the webrev for a detailed description of the changes.
> 
> If required, I'll make break-out changes to be reviewed separately.
> 
> I had posted a RFR before, but improved the change to 
> give a more complete overview of currently supported flags
> for the CSR:
> http://mail.openjdk.java.net/pipermail/hotspot-dev/2017-October/028615.html
> 
> Best regards,
>  Goetz.
>