Initial work on converting the iface1/iface2 column of the wires table
to strings that represent how the ports are actually addressed by the switch. Eventually card/port will be fully deprecated, but before we can do that there has to be a way to automatically update existing sites. Kirk will probably be the one to finish this off since I don't know enough about the devices to do it correctly. Also a minor structural change; move the convertPortFormat() constants from the device files to snmpit_lib so we can call convertPortFormat from outside the device file.
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