[Merge] lp:~evfool/update-manager/fix665173 into lp:update-manager

[Barry Warsaw]

Hmm, I guess the only problem could be that if one changelog source gave an HTTPError and then another source gave an BadStatusLine error (for example), you'd only see one of the two error messages, but maybe that's not terrible.  If you were to get both errors, you've definitely got problems. ;)
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https://code.launchpad.net/~evfool/update-manager/fix665173/+merge/55663
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~evfool/update-manager/fix665173 into lp:update-manager.