• Convert turnstiles and sleepqueus to use UMA. This provides a modest speedup and will be more useful after each gains a spinlock in the impending thread_lock() commit.
• Move initialization and asserts into init/fini routines. fini routines are only needed in the INVARIANTS case for now.

Submitted by: Attilio Rao <attilio@FreeBSD.org>
Tested by: kris, jeff