Merge branch 'release/1.6.12' into develop
Change timeout management for rendernode requests
Make "node/status" request asynchronous

Avoid blocking dispatcher when long running cancel command arise (usually when RN are unreachable because of swap)
Clean asynchronous "cancel" webservice

- Standard cancel "/nodes/<id>/status" is now asynchronous
  A user defined timeout can be set when contacting running RNs.
  The requesting client (pulback) will still wait until the end of the whole cancel
  but other commands will be treated inbetween.

- New webservice is added: "/nodes/<id>/cancel to handle the specific cancel job case
  The server part (cleaning command in the list) is executed very quickly
  Then a thread is started to send cancel request to each running RNs in background
  Thus the client is not blocked until each RN has timed out.
  RNs that encounter a problem will still be cleaned and marked as "quarantine"
Merge branch 'feature/timeout' into develop
Remove test code in worker
Correct allocated RN value

when updating allocRN, when add the number of RN of each poolshare related to each node.
Thus we keep a consistent value to display in pul_query.

A fix must be done to pulback to display the correct value
Remove comment in request manager
Server accepts additionnal info from worker: systemSwapPercentage

This data is stored in the rendernode model and can be queried with pul_rn
Older version of the worker (<1.6.13) will still work
Update worker info

- Worker has an additionnal value indicating the percentage of swap used.
- A delay can be defined to force a full update of the worker after
  a long period of time. This ensures that even without registering worker,
  the data will be fresh (delay is set to 5mn by defaut).
  This delay should be much higher thant worker heartbeat (8s), usually several minutes
- update display in pul_rn
Merge branch 'feature/protect_worker_swap' into develop
Update version to 1.6.13

Change delay on worker for full update -> 15mn
Merge branch 'release/1.6.13'