If a list of interfaces is supplied via the command line or

dhcpd.interfaces then

a) don't bother looking up information on interfaces that were not
requested;

b) don't exit if a requested interface is not found, just issue a
warning message;

c) exit if none of the interfaces were found.

The command line for dhcpd shown in ps will continue to show requested
but ignored interfaces.

As usual with dhc* code, whack a bunch of unused states, constants,
flags, etc. Since we only invoke discover_interfaces() with
DISCOVER_SERVER, there is no need to keep track of other
possibilities.

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