[Merge] lp:~jamesodhunt/upstart/set-env--global-apply-to-running-jobs into lp:upstart

[Stéphane Graber]

Review: Approve

This code is currently in use in my test packages and has correctly fixed the issue I had with the dbus job.

I don't have any strong feeling about reset-env as I'm not using it myself.
-- 
https://code.launchpad.net/~jamesodhunt/upstart/set-env--global-apply-to-running-jobs/+merge/148754
Your team Upstart Reviewers is requested to review the proposed merge of lp:~jamesodhunt/upstart/set-env--global-apply-to-running-jobs into lp:upstart.