Change mapping process

Currently, we assign machines to rooms depending on their domain name. For instance, a machine in the domain cisco.kb.sm.cri.epita.fr will be assigned to the room Cisco in the site KB. This won't work for all rooms, as some might be in the same subnet and thus get the same domain. For instance, a machine in Strasbourg will be in stg-irn.sm.cri.epita.fr and thus we don't know what room it actually is in.

The proposal I make is to add a field currently_mapping to the Room model, defaulting to False. Only one room can be mapping at a time (as we would use that field to know which room the machine is in). As such, we would check that only one room is mapping. We mapping a room, we would have to set that field to True on the room we're mapping. As we might forget to turn it off, I suggest scheduling a task an hour later or so to automatically turn it off.