Create queue attribute for queues that do not depend on disk IO
For the next migration of low-urgency-cpu-bound
from VMs to Kubernetes we would like to create a specific selector for jobs that do not depend on disk IO. This will be useful for this migration and future migrations so that we can start migrating queues that we sure are "safe" and do not depend on shared storage.
Example: tags!=requires_disk_io
Also see scalability#261 (closed)
cc @andrewn