Code review comment for lp:~albaguirre/mir/fix-1522581

Actually, (some of) these comments seem to be out-of-date?

# TSan does not support multi-threaded fork
# TSan may open fds so "surface_creation_does_not_leak_fds" will not work as written
# TSan deadlocks when running StreamTransportTest/0.SendsFullMessagesWhenInterrupted - disable it until understood