Goes in pair with T265339.

We need the decommission cookbook to:

1. For all revenue interfaces on a given decommissioning device
   1. Check if a cable is connected
   2. Set the remote side of the cable (switch interface) to disabled
   3. Remove any vlan configuration
2. Run Homer

It should also stop deleting the interfaces so the cables don't get deleted automatically, to match the onsite reality and instead delete the IPs attached to the interfaces only.

Then later on, the offline script needs to:

1. Delete all interfaces and connected cables.