This is the initial logic which will give a jail its own init,
have a dedicated kernel process "0" (swapper) per jail, its
own pid, etc. space if enabled.
Add ddb support to aid debugging as was done for vnet.
Obtained from: http://www.7he.at/freebsd/vps/files/diffs/vps-r215.diff
(parts, originally as provided by iXsystems, Inc.)
Sponsored by: iXsystems, Inc.