Description of problem:

The testsuite is eventually leaking threads. Some of these causes could eventually cause dead locks.

Version-Release number of selected component (if applicable):


How reproducible:

always

Steps to Reproduce:
1. Fix UnitTestCase::checkThread (it was broken, which is also part of this change)
2. Run the testsuite and look for results
  
Actual results:

Threads will keep running after the tearDown of a test

Expected results:

All threads should be stopped

Additional info:

The testsuite checkThread is a way to keep the testsuite clean. This won't cause any issues in production but it will keep the sanity of the code.