Protect interface queues with read once and mutex.

Protect interface queues with read once and mutex.

Reading atomic values need at least read once and writing values
should have a mutex.  This is what mbuf queues already do.  Add
READ_ONCE() to ifq and ifiq macros for len and empty.  Convert
ifq_set_maxlen() to a function that grabs ifq_mtx.

OK mvs@