Add tests to ensure master is not called when using common Computer methods with empty computer_guid

Just doing it by factoring code.

It should not take to much time to start allocation on this computer

Use the capacity_scope category on computer to desactivate everything.
The alarm is now able to open/close the allocation.

It now checks: edit workflow, access log and capacity usage.

Respond immediately with no data in case of no cached information and register
cache filling.

In case if data are available, but older then 5 minutes, request its
recalculation.

10 was used for socket.AF_INET6, but it is 30. So don't hardcode values.

10 was used for socket.AF_INET6, but it is 30. So don't hardcode values.

Of course, this is bad...