[api] report also operation on binary release search results
[api] support binary release search for operation

and fix xpath syntax for disturl and supportstatus
[api] run some delayed jobs in special queues

* bug issue tracker job runs in extra queue to avoid that an external slow
  bugzilla server is slowin down processing all jobs
* binary tracker is doing heavy SQL load, so limit it to one job
[backend] fix media to medium attribute for product pool repos