[7u12] Request for approval : Collisions.java TEST_BUG fixes (7189926, 7198988, 7199249)

[Mike Duigou]

I would like to backport these test changes to JDK 7u so that the relevant test does not have to be kept on the exclusion list. This work has now been running successfully in JDK 8 since September 18th.

There are three issues:

7199249: TEST_BUG : Add /othervm to Collisions.java @run main with -D definitions
http://hg.openjdk.java.net/jdk8/tl/jdk/rev/e7add6d98729

7198988: TEST_BUG : re-order paramaters for Collision.java @run
http://hg.openjdk.java.net/jdk8/tl/jdk/rev/e20a2e6a92f7

7189926: TEST_BUG : Reduce test size for default run. Add additional run enabling alternative hashing.
http://hg.openjdk.java.net/jdk8/tl/jdk/rev/92f3cda88d8e

The changesets are identical to those applied for JDK8 repo and will be imported via "hg import"

Mike