sys/cddl/compat/*/vnode.h: Implement rename/remove syscalls

Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
sys/cddl/compat/opensolaris: Stub out (WIP)

Stub out function so we can continue to build..

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