Regression in icedtea-web - parent classsloader have been stopped to be invoked

[Jiri Vanek]

After this commit -
  changeset:   514:855087771e7e
  tag:         tip
  user:        Adam Domurad <adomurad at redhat.com>
  date:        Tue Aug 28 14:36:06 2012 -0400
  summary:     Fix for PR920: Classes attempted to load twice when class extends from outside jar

There is regression that parent class loader is never used for searching in classes. I blame also 
review a lot (me:-/) because unittest was broken by this commit.

See: CodeBaseClassLoaderTest.testParentClassLoaderIsAskedForClassesApplication as reproducer.

Sorry for late notification,
   J.