these tests are a bit outdated, they change the system configuration and are
not useful anymore, they were basically written to understand how stuff works.

tst-bsd-netdriver.c - was made just to figure out the network driver model of
                      freebsd.
tst-bsd-netisr.c    - same for isr layer, this tests runs over the ARP isr and
                      the system is badly wounded after it runs, it is useless today
                      and was written to figure out how netisr works.
tst-virtionet.c     - testing network interface creation using virtio,
                      today the interface is created anyway.