Use low-memory-usage.yaml in tripleo jobs
Use low-memory-usage.yaml in tripleo jobs

low-memory-usage.yaml is generally used in TripleO standalone jobs now,
thus it is better to enable it in TripleO jobs in each puppet modules.

Change-Id: I40145696225bda8ab2b229148a5fbec9249df7e0

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration