
Reduce the multinode concurrency and number of VMs so we don't run Rackspace VMs out of disk space. This is an issue that was reported by the infra team. [0]: http://eavesdrop.openstack.org/irclogs/%23openstack-ironic/%23openstack-ironic.2019-12-16.log.html#t2019-12-16T17:38:15 Change-Id: I867bac9e247605e561cc7ee4522f70ce6de368d4