sys/cddl: 'vmm_guest' in dfly over freebsd's 'vm_guest'

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
sys/cddl: Lockup 'opensolaris_atomic.c' with lockmgr

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
sys/cddl/*/opensolaris_kmem.c: Convert to objcache allocator

Dragonfly uses objcache(9) over uma(9) for its Bonwick slab
allocator implementation.

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
sys/cddl: Convert opensolaris_taskq.c to objcache allocator

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
sys/cddl/*/opensolaris_kobj.c: Fixup vn_close() usage

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>