/hurd/init as pid 2, running runsystem as pid 1

[Justus Winter]

Hi,

attached is a patch that reserves pid 1 for whatever process
/hurd/init starts. runsystem.sysv for example execs /sbin/init, so
sysvinit is happily running as pid 1.

/hurd/init get's to be pid 2, so everyone who needs shutdown
notification now has to talk to pid 2. The kernel and other servers
just move one pid further, I found noone hardcoding one of those pids
other than the kernel one in init.

Comments?
Justus