big patch to simplify pool code.

remove pool_cache code.  it was barely used, and quite complex.  it's
silly to have both a "fast" and "faster" allocation interface.  provide
a ctor/dtor interface, and convert the few cache users to use it.  no
caching at this time.

use mutexes to protect pools.  they should be initialized with pool_setipl
if the pool may be used in an interrupt context, without existing spl
protection.

ok art deraadt thib

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