openstack: Fail the job if cluster delete fails

We do not want to merge code that breaks cluster delete. As such,
check the exit code from cluster delete, and fail the job if it
is nozero.

ci-operator/templates/openshift/installer/cluster-launch-installer-openstack-e2e.yaml

@@ -487,12 +487,13 @@ objects:
 
           echo "Deprovisioning cluster ..."
           openshift-install --dir /tmp/artifacts/installer destroy cluster
+          DELETE_FAIL=$?
 
           echo "Nuking any resources left"
           nuke
         }
 
-        trap 'teardown' EXIT
+        trap 'teardown; exit $DELETE_FAIL' EXIT
         trap 'kill $(jobs -p); exit 0' TERM
 
         for i in $(seq 1 180); do