reimplement interface bound states in a non-retarded way.

previously, we had a set of state tables attached to each interface. so for
every packet we had to do a lookup in the tables for the interface, and
afterwards in the global tables.
since we split state keys and states now, use only the global tables, and
put the actual states in a tail queue attached to the state key. sort the
list so that ifbound states come before global ones. on lookup, we only
have to compare the interface pointer on the actual states and use the
first one where either the interface matches or the state is not interface
bound. thus, if you don't actually use ifbound states, and there is only
one state per state key, the overhead is close to zero, where we had extra
lookups before. in addition to a much cleaner design (that'll allow for more
goodies later) this gives us ~12.5% more forwarding performance.
mostly hacked at c2k7, lots of help, testing and ok mcbride & markus

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