Remove exit code from traps in tests

Having the trap exit with a specific code will override
the exit code that caused the trap to run, which could
mask errors

test/integration/targets/incidental_inventory_docker_swarm/runme.sh

@@ -8,7 +8,6 @@ cleanup() {
     echo "Cleanup"
     ansible-playbook playbooks/swarm_cleanup.yml
     echo "Done"
-    exit 0
 }
 
 trap cleanup INT TERM EXIT