RFR(S): 8211350: Remove jprt support

[Alan Bateman]

On 02/10/2018 08:21, Mikael Vidstedt wrote:
> Please review this change which removes support for, and references to, the (Oracle internal) JPRT system.
>
> bug: https://bugs.openjdk.java.net/browse/JDK-8211350
> webrev: http://cr.openjdk.java.net/~mikael/webrevs/8211350/webrev.00/open/webrev/
>
Does the change to Helper.java and tests that use it break testing of 
exploded builds? I don't know why it has the comment "JPRT not yet 
ready" but whether $JAVA_HOME/jmods exists or not isn't connected to 
JPRT or any build or test system.

-Alan