multi-FIB changes for GENERIC

[Bjoern A. Zeeb]

Hi,

back in September last year I had prototyped a patch to make the multi-FIB
kernel option just a default removing the need for it to be set for the
maximum number of FIBs allowed.  This is allowing the multi-FIB feature to
be used with GENERIC kernels by just changing the tunable.

Thanks to Alexander eliminating the last consumers of RT_NUMFIBS in code, this
is now possible.  I haven't boot-tested the re-done patch below yet but it should
be fine and passes the compile test.  Please test and review.

This is also a next step to allow growing the number of FIBs available more
easily in the future (subject to mbuf changes).

http://people.freebsd.org/~bz/20120315-01-rt_numfibs.diff

/bz

-- 
Bjoern A. Zeeb                                 You have to have visions!
   It does not matter how good you are. It matters what good you do!