[Merge] lp:~rbalint/ubuntu-release-upgrader/raise-privileges-in-do-partial-upgrade-too into lp:ubuntu-release-upgrader

[Brian Murray]

Review: Needs Fixing

do-partial-upgrade is missing an import of subprocess but once I added that it seems to be working.
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https://code.launchpad.net/~rbalint/ubuntu-release-upgrader/raise-privileges-in-do-partial-upgrade-too/+merge/337513
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