can't check to see if sysinstall is running as init just by checking if the
PID is 0. Introduce a new option that sets the RunningAsInit flag, and update
the code to check RunningAsInit intstead of getpid().
PR: bin/38854
Submitted by: Peter Sedeffow <peter at trumanbrewery.com>
Approved by: rrs (mentor)
MFC after: 1 month