3605: Add "queue_position" to jobs.  Also add a route on jobs controller to get
the true size of the job queue.
3605: Test queue_size method and queue_position field.  Adjust "GET queue"
tests for jobs controller to test that users don't see queue items for which
they do not have permissions.
3605: Use #each_with_index instead of #each_index
Merge branch '3605-queue-position-size' refs #3605