RFR 8177471: jlink should use the version from java.base.jmod to find modules

[Sundararajan Athijegannathan]

Please review.

Bug: https://bugs.openjdk.java.net/browse/JDK-8177471
Webrev: http://cr.openjdk.java.net/~sundar/8177471/webrev.00/index.html

Thanks to Mandy for initial (internal) round of review and suggesting me 
simplifications on my initial version of test.

Thanks,
-Sundar