Consider updates to switch configurations

[owendelong]

1. Add a link local address on the me-0 and VLAN.X03 interfaces of fe80:: where is the switch number.
2. Make it so that Z group switches receive me0 and VLAN interface configs just like all other switches
3. Put both management VLAN interfaces and default routes on all switches so that the switch can be reached even if it got configured for the wrong building.

With these changes implemented, we should see the following advantages:

1. A switch that has any of these configs on it should be reachable almost no matter what... Worst case, any adjacent device should be able to reach it via IPv6 Link Local if it knows the switch number (assuming the config matches the switch number).
2. A switch that comes up in the wrong building should be reachable to reconfigure so that it can be remotely flashed without disrupting the network in the building where it is deployed.
3. A switch that is misconfigured should be identifiable and most likely reachable via its LL address to be configured enough that it can be properly reached for refreshing.