[Merge] lp:~jamesodhunt/upstart/check-for-overlayfs into lp:upstart

[James Hunt]

Hi Steve,

Yes, that would clearly be more efficient, but I'm not wholly convinced we need to do this since the current approach is simple, it works and we only call this test-only function once anyway. Additionally, the current approach avoids the need to retain the '#ifndef OVERLAYFS_SUPER_MAGIC' forever to handle non-Ubuntu systems.

I've raised bug 1247769 on the kernel headers for the missing define though.

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https://code.launchpad.net/~jamesodhunt/upstart/check-for-overlayfs/+merge/191393
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