[Merge] lp:~jamesodhunt/upstart/bug-980917-reworked into lp:upstart

[Steve Langasek]

Correction: /dev/ptmx is *not* created at the same time that /dev/null is.  So there may be a small race allowing the unix98 pty driver to have not been initialized by the time of devtmpfs mount, whereas the others should never need to be created by hand because they're guaranteed available on the devtmpfs before the handoff to init.
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https://code.launchpad.net/~jamesodhunt/upstart/bug-980917-reworked/+merge/118132
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