remove drain hooks from pool.

1.  drain hooks and lists of allocators make the code complicated
2.  the only hooks in the system are the mbuf reclaim routines
3.  if reclaim is actually able to put a meaningful amount of memory back
in the system, i think something else is dicked up.  ie, if reclaiming
your ip fragment buffers makes the difference thrashing swap and not,
your system is in a load of trouble.
4.  it's a scary amount of code running with very weird spl requirements
and i'd say it's pretty much totally untested.  raise your hand if your
router is running at the edge of swap.
5.  the reclaim stuff goes back to when mbufs lived in a tiny vm_map and
you could run out of va.  that's very unlikely (like impossible) now.
ok/tested pedro krw sturm

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