use default OID if missing in model
alternative method to detect remote devices

Ok, we tried to find the remote devices using dot1dTpFdbAddress without success,
let's try by using dot1qTpFdbPort this time. This alternative solution is known
to work at last with Juniper ex2200 devices.
Merge branch '2.3.x' of git+ssh://forge.fusioninventory.org/git/fusioninventory/agent into 2.3.x+juniper-fixes
Merge branch '2.3.x' into 2.3.x+juniper-fixes
refresh the Changes and THANKS files