Use 'pipefail' in openstack template

Installer was failing, the grep caused setup to be "successful", and
the test container then immediately failed.

Ref openshift#6718

Author: mandre

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

@@ -289,7 +289,7 @@ objects:
       - -c
       - |
         #!/bin/sh
-        set -e
+        set -euo pipefail
 
         trap 'rc=$?; if test "${rc}" -eq 0; then touch /tmp/setup-success; else touch /tmp/exit /tmp/setup-failed; fi; exit "${rc}"' EXIT
         trap 'CHILDREN=$(jobs -p); if test -n "${CHILDREN}"; then kill ${CHILDREN} && wait; fi' TERM