This will prevent subsequent failures from overwriting the verdict so we
can easily see the root cause of the test failure.
Using testcase.stop instead for errors internal to our test
infrastructure to mark them as test errors instead of failed.
Change-Id: Idc6819aaf0b01e70c38fad828dd44dcec6bdd778
The L1CTL socket path can be configured as module parameter of
the L1CTL_PortType module, so there's no need in repeating that
configuration inside LAPDm_RAW_PT