The test starts the last one: after the driver and the net stack.
However, the net stack (due to DAD and else) will already try to send
some packet, resulting it giving a uninitialized semaphore. But once
properly initialized, this semaphore will end up with a non-zero count
when the test will start: thus reseting it to 0 before running the
tests.
Jira: ZEP-2319
Reported-by Andrew Boie <andrew.p.boie@intel.com>
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>