Julia Kreger da704d9ec8 Tune down multinode concurrency
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
2019-12-16 11:56:04 -08:00
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