Code Review - 6776144 java/lang/ThreadGroup/NullThreadName.java fails with Thread group is not destroyed ,fastdebug LINUX

[Gary Adams]

  Here's another test that had an assumption that the threads
would terminate within a 10 second window. On a busy or
slow machine this limit may not be sufficient. Since the jtreg
harness uses 120 second default value for terminating a
test, the test should not be more restrictive.

   http://cr.openjdk.java.net/~gadams/6776144/