[Merge] lp:~jamesodhunt/upstart/allow-multiple-cmdline-confdirs into lp:upstart

[Stéphane Graber]

I think the change looks good and agree that it's probably a good idea to limit this to Session Init for now.

Should we have some tests for this? I'd think the following cases would be good to test:
 - User, no --confdir => loads all jobs from default paths
 - User, --confdir a => only loads jobs from "a"
 - User, --confdir a --confdir b => loads jobs from "a" and "b"
 - System, no --confdir => loads all jobs from default path
 - System, --confdir a => loads all jobs from "a"
 - System, --confdir a --confdir b => loads all jobs from "b"
-- 
https://code.launchpad.net/~jamesodhunt/upstart/allow-multiple-cmdline-confdirs/+merge/156512
Your team Upstart Reviewers is requested to review the proposed merge of lp:~jamesodhunt/upstart/allow-multiple-cmdline-confdirs into lp:upstart.