[Merge] ~renanrodrigo/update-notifier:respect-phasing into update-notifier:master

[Athos Ribeiro]

I was only looking at the 404 errors there.

These are no flaky tests. pycodestyle is failing indeed. I was overlooking the fact that test/apt_check.py is a symlink to data/apt_check.py. The docstring is 80 chars long and the testsuite is checking for <= 79.
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https://code.launchpad.net/~renanrodrigo/update-notifier/+git/update-notifier/+merge/438009
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