Update lo unit in properties file to match testbed.

There is a logical router in testbed using lo0.73 interface.
A second logical router with the same interface cannot be created in the same physical one.

This patch changes the unit use from 73 to 102.
Merge pull request #466 from isartcanyameres/fix/lo-units-to-match-testbed

Update lo unit in properties file to match testbed.