RFR: JDK-8217894: jpackage CLI syntax changes

[Andy Herrick]

Please review the jpackage fix for  [1] at [2].

This is a fix for the JDK-8200758-branch branch of the open sandbox 
repository (jpackage).

In response to internal and external feedback, the following syntax 
changes are being made to jpackage Command Line Interface (CLI):

1.) remove "create-jre-installer <type>" mode, and add 
--runtime-installer option.
2.) remove the <type> arg from create-image mode, and add 
--installer-type option.
3.) rename the --class option to --main-class
4.) remove the --limit-modules option
5.) rename the --force option to --overwrite and improve it's help text.

[1] https://bugs.openjdk.java.net/browse/JDK-8217894

[2] http://cr.openjdk.java.net/~herrick/8217894/webrev.01/index.html

/Andy