Re-enable Limestone at 10 nodes with custom labels
Re-enable Limestone at 10 nodes with custom labels

This will allow us to troubleshoot issues we've noticed with Limestone.
Using custom labels means normal jobs won't be impacted.

Change-Id: I28748caf5ee8d059a25d9c38429e0ad57c99b8b5

openstack-infra/project-config,openstack-infra/project-config