RFR: JDK-8191820 run-test jtreg test selection and component calculation broken since consolidation

Thu Nov 23 14:20:23 UTC 2017

The test selection and component calculation for jtreg tests have been 
broken since the consolidated and restructured forest.

This fix will restore component calculation (which solves issues with 
incorrect component-specific settings, such as nativepath). It also 
allows for a more flexible test selection mechanism, better suited to 
the new test structure, while at the same time cleaning up at least a 
bit of the almost incomprehensible make function.

Bug: https://bugs.openjdk.java.net/browse/JDK-8191820
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8191820-fix-jtreg-test-selection/webrev.01

/Magnus