[rfc][icedtea-web] rewritten xfork test

[Jiri Vanek]

Inspired by Omair's effort to reduce failing tests, I have rewritten deadlock tests, which were 
failing quite randomly in half of the cases. It was caused by delayed removing of zombies after 
process have time-outed.

By this patch, ignorelist which I have proposed two days ago (and will do again soon as separate 
patch) to ignore no-testable classes (eg  interfaces), and fixes from [RFC][icedtea-web] fixes to 
reproducer engine, we will be on three  failing reproducers ("spaces" ) and  with occasional cache 
test fill.

All those five -  two sometimes, three regularly - failing reproducers are the same issue we are 
talking  in [icedtea-web] RFC: disable tests that are known to fail thread. - they are representing 
issue., but...:)



2012-03-22  Jiri Vanek <jvanek at redhat.com>

	Rewritten DeadLockTestTest to stop failing in more then 1/2 of cases
	All assassinated processes were hanging as zombies, killed forcibly by
	kill -9 now.
	* /tests/jnlp_tests/simple/deadlocktest/testcases/DeadLockTestTest.java:
	(countJavaInstances) now return pids of found javas.
	(killDiff) new method killing zombie javas forcibly.
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