Small set of changes to make snmpit work correctly for the control router. I...
Small set of changes to make snmpit work correctly for the control router. I also added entries in the database for ports that are in vlans (other than the default #1) that aren't connected to a node in the database. So, from now on, when an empty port is in a vlan, we need to put an entry in the wires table that says its connected to node 'empty' on some unused port number.
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