EntryProcessorTest. Waiting for safe state after shutting down one node

closes #4224 

If adding `waitAllForSafeState ` is fixing this failure, it may be fine to add but if this test is not fixable with current guarantees, it is better to remove/ignore the test. So, as far as i understand, you did not manage to reproduce the failure after addition of `waitAllForSafeState`?