Need reviewer: Added test target and makefile cleanups

[Kelly O'Hair]

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