[Merge] lp:~xnox/upstart/user-log-dir into lp:upstart

[James Hunt]

The reason we don't honour the LOGDIR_ENV variable for Session Inits is to handle the scenario where the root user starts its own Session Init: if that is to happen, we don't want the root Session Init to log to the same directory as Upstart running as PID 1 should the LOGDIR_ENV variable be set when root starts the Session Init.

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https://code.launchpad.net/~xnox/upstart/user-log-dir/+merge/143091
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