[Merge] lp:~ted/upstart/obj-path into lp:upstart

[Steve Langasek]

Review: Approve

Obviously correct that we should not be overriding the special variable name "PATH" with something here.  This breaks compatibility, but the current behavior is sufficiently wrong that I don't think we need to worry about preserving compatibility.
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https://code.launchpad.net/~ted/upstart/obj-path/+merge/183259
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