Fix ZUUL_REF on puppet-openstack-integration-checkout
Fix ZUUL_REF on puppet-openstack-integration-checkout

Fix ZUUL_REF on puppet-openstack-integration-checkout JJB builder,
so we quote correctly, and avoid this error:

ZUUL_REF=${{ZUUL_REF:-None}}: bad substitution

Change-Id: I7424b20693856a978a406e0ac8554ca02ac871e7

openstack-infra/project-config,dongwenjuan/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config,Tesora/tesora-project-config