[Merge] ~chad.smith/ubuntu-release-upgrader:esm-support-pro-upgrades into ubuntu-release-upgrader:ubuntu/master

[Brian Murray]

FYI - the debian/changelog referenced the same bug number twice. I'll sort it out though.
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https://code.launchpad.net/~chad.smith/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/391183
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