ansible: ttcn3: install netcat-openbsd

Make nc available on jenkins nodes running ttcn3 tests, as it is now
used by ttcn3-hss-test-ogs.

Related: docker-playground Iebeefd9689ae2efa54678b99ff929ca255ec64d1
Change-Id: I397d4fe33813b083b61cdabb1d00ab4ea63a456b
1 file changed