[Merge] lp:~sjakthol/update-manager/fix-slow-calculation into lp:update-manager

[Michael Terry]

One more thing.  If you run nosetests3 in your checkout, you'll see that the pep8 and pyflakes tests fail.  Please fix those errors.  But beyond that, I think this is good to approve.

(Don't worry if test_is_port_listening fails for you; that just means you aren't running ssh.  It's not a good test.)
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https://code.launchpad.net/~sjakthol/update-manager/fix-slow-calculation/+merge/161284
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~sjakthol/update-manager/fix-slow-calculation into lp:update-manager.