tests: junit_tests.sh: Instead of running tests from specific packages, run...

tests: junit_tests.sh: Instead of running tests from specific packages, run *Test.class tests from everywhere and keep a blacklist e.g., do not run *ExternalIntegrationTest.class.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3548 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534