[Merge] lp:~clint-fewbar/ubuntu/natty/upstart/restore-re-exec-code into lp:ubuntu/upstart

[Clint Byrum]

FYI, this is insufficient to stop root FS corruption.

I tested this on lucid, and occasionally it still fails the remount of /

This is because the SIGTERM signal is sent by telinit u, but then we don't wait for upstart to re-exec itself before moving on to the umount. This fails about 50% of the time on lucid.

The simple, but incomplete, solution is to add a sleep 1 after telinit u. The more appropriate solution is to have telinit ptrace 1 with PTRACE_O_TRACEEXEC.
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https://code.launchpad.net/~clint-fewbar/ubuntu/natty/upstart/restore-re-exec-code/+merge/45295
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