RFR : 8006594/8006595 : Define jdk_core test set

[Mike Duigou]

Hello all;

This is a two piece patch. 

8006594: Add jdk_core target to jdk/test/Makefile
8006595: Use jdk/test/Makefile targets in preference to local definitions

I chose to do it as two patches because the changes are in different repos and the changes in 8006594 could be committed without the 8006595 changes.

The webrevs are:

http://cr.openjdk.java.net/~mduigou/8006594/0/webrev/

http://cr.openjdk.java.net/~mduigou/8006595/0/webrev/

The overall goal is to provide a target to the top level OpenJDK for a core set of tests. ie.

make test TEST=jdk_core

The "core" test set is the set of JDK tests which should be run to smoketest prior to posting a webrev or committing any OpenJDK change or for nightly regression testing. These patches are the first of a planned series of patches to incrementally improve test execution and the selection of tests.

I would like to commit these changes to jdk8/build repo so will need a committer from that project to push the changes for me once reviewed.

Mike