It was removed accidentally during update/refactor

Signed-off-by: Gabor Szalai <gabor.szalai@ericsson.com>

Updated to use the new test port API to avoid the FD_SET limit.
IPv6 compatibility update.

Signed-off-by: Gabor Szalai <gabor.szalai@ericsson.com>

Signed-off-by: balaskoa <Jeno.Balasko@ericsson.com>

Signed-off-by: balaskoa <Jeno.Balasko@ericsson.com>

Use SO_REUSEADDR to quickly re-use addresses

If a new test cases starts immediately after the old one ends, chances
are high it will want to bind the exact same IP/port again.

SO_REUSEADDR is the standard mechanism to achieve this.

Signed-off-by: Harald Welte <laforge@gnumonks.org>