[Merge] ~rbalint/ubuntu-release-upgrader:ubuntu/master into ubuntu-release-upgrader:ubuntu/master

[Brian Murray]

Michael and I both tested moving "systemd-timesyncd | time-daemon" from a Depends to a Recommends of systemd and doing so made ubuntu-release-upgrader keep chrony installed.
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https://code.launchpad.net/~rbalint/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/382454
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