RFR: JDK-8234402: revert change that stopped providing JPackageToolProvider

Wed Nov 20 00:00:45 UTC 2019

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 change restores JPackageToolProvider and gets rid of the temporary 
factory class.

[1] https://bugs.openjdk.java.net/browse/JDK-8234402

[2] http://cr.openjdk.java.net/~herrick/8234402/webrev.02/

/Andy