kernel: Remove global PROC_LOCK and PROC_UNLOCK definitions

Locking in this area varies so much between FreeBSD and DragonFly
that it's best to determine what to do with these macros on a
case-by-case basis
Document DRIVER_MODULE_ORDERED(9)
Document copyin_nofault and copyout_nofault(9)
add .Mt to man pages in sbin/
add .Mt to man pages in libexec/
add .Mt to man pages in lib/