RFR: JDK-8233592: change --package-type option name to --type and allow -t short form

[Andy Herrick]

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

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

This changes the --package-type option to just --type , and adds the -t 
short form.

[1] https://bugs.openjdk.java.net/browse/JDK-8233592

[2] https://cr.openjdk.java.net/~herrick/8233592/ 
<http://cr.openjdk.java.net/~herrick/8233592/>

/Andy