open5gs: fix stopping of open5gs components after test finishes

use RemoteProcessSafeExit() for launching all open5gs components
to make sure they are stopped at the end as well.

Change-Id: Ia1439577d60f9694da70c4e42c621100c8ef295e
diff --git a/src/osmo_gsm_tester/obj/smf_open5gs.py b/src/osmo_gsm_tester/obj/smf_open5gs.py
index 5241dc2..eda1aa2 100644
--- a/src/osmo_gsm_tester/obj/smf_open5gs.py
+++ b/src/osmo_gsm_tester/obj/smf_open5gs.py
@@ -75,8 +75,9 @@
         remote_binary = self.remote_inst.child('bin', Open5gsSMF.BINFILE)
 
         args = (remote_binary, '-c', self.remote_config_file)
+        remote_run_dir = util.Dir(util.Dir(Open5gsSMF.REMOTE_DIR).child(Open5gsSMF.BINFILE))
 
-        self.process = self.rem_host.RemoteProcess(Open5gsSMF.BINFILE, args, remote_env=remote_env)
+        self.process = self.rem_host.RemoteProcessSafeExit(Open5gsSMF.BINFILE, remote_run_dir, args, remote_env=remote_env)
         self.testenv.remember_to_stop(self.process)
         self.process.launch()