scheduler->swapper, SI_SUB_RUN_SCHEDULER->SI_SUB_LAST

[Andriy Gapon]

I would like to propose the following mostly cosmetic change:
http://people.freebsd.org/~avg/scheduler-swapper.diff

This is something that bit me early in my FreeBSD days, so I am kind of obsessed
with it.
The current naming is confusing/misleading indeed.
And magic properties of SI_SUB_RUN_SCHEDULER:SI_ORDER_LAST is a "hidden gem".

-- 
Andriy Gapon