RFR: JDK-8149777: Enable enhanced failure handler for "make test"

[Erik Joelsson]

Please review this change which adds a proper makefile and build 
sequence for the failure-handler jtreg plugin. It also adds the failure 
handler to the test image and makes the hotspot and jdk test/Makefile's 
pick it up when available.

Bug: https://bugs.openjdk.java.net/browse/JDK-8149777
Webrev: http://cr.openjdk.java.net/~erikj/8149777/webrev.03/

/Erik