ggsn_tests: f_wait_icmp4: don't shutdown on error

Use setverdict(fail, …) instead of shutting down the test. Otherwise we
don't close the PDP context. This fixes TC_pdp6_act_deact failing if it
runs after a failed TC_pdp4_act_update_teid.

Change-Id: Ib31481e79fc81983ae0c36f0512c6b7dba3f28a8
1 file changed