[7u60] Request for approval : Test stabilization fixes 8026405, 8022213, 8028583

[Seán Coffey]

Hi,

I'd like to backport these test stabilization fixes from jdk 8 to 
jdk7u-dev. All patches apply cleanly. I've run the tests through JPRT 
and all looks good.

8026405: javax/xml/ws/clientjar/TestWsImport.java failing on JDK 8 
nightly aurora test runs
http://hg.openjdk.java.net/jdk8/tl/jdk/rev/ee7f1c78bec7

8022213: Intermittent test failures in java/net/URLClassLoader
http://hg.openjdk.java.net/jdk8/tl/jdk/rev/70f1bed5e7fd

8028583: Add helper methods to test libraries
http://hg.openjdk.java.net/jdk8/tl/jdk/rev/d1bb85f0a45a

regards,
Sean.