[Merge] ~brian-murray/update-notifier:livepatch into update-notifier:master

[William Wilson]

Looks good to me. I mocked up a fake /snap/bin/canonical-livepath to run through some different scenarios and it works as expected.
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https://code.launchpad.net/~brian-murray/update-notifier/+git/update-notifier/+merge/413982
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