Reorganize for cleaner upcoming addition
Reorganize for cleaner upcoming addition

The next patch will add in code to get the interface's current mac address,
and some of the stuff already here is used for both IP and MAC address
filtering. Separate those lines from the address-filtering code to make
it more obvious.

emaste/netcf,osier/netcf,emaste/netcf,hallyn/netcf,osier/netcf,seanbruno/fbsd-netcf,seanbruno/fbsd-netcf,osier/netcf,battlemidget/deprecated-mingw32-netcf,hallyn/netcf,emaste/netcf,seanbruno/fbsd-netcf,hallyn/netcf,battlemidget/deprecated-mingw32-netcf