Need reviewer: Added test target and makefile cleanups
6960335: Add top level 'make test' rule that uses test/Makefile, runs all test batches
6960853: Cleanup makefiles, remove unused vars etc. http://cr.openjdk.java.net/~ohair/openjdk7/test-target-cleanup/webrev/ Brings jdk7 in sync with openjdk6 too. This should allow for: make && make test -kto
