QA could hung when stopping trace session

[hvlad]

The problem was found when run few instances of QA concurrently.

The problem happens when code tries to stop existing trace session.
To do it, it makes new connection to the services manager to run "Stop Trace Session" service.
If that new connection can't be established by any reason, the 'trace_thread' left working and application (QA test) can't exit correctly.