[Merge] lp:~canonical-platform-qa/ubuntu-test-cases/server-preseed into lp:ubuntu-test-cases/server

[Max Brustkern]

Yeah, I'm seeing the same problem on some images but not others, so my best guess is some kind of race. I'm not sure how best to proceed on that. We no longer do apt changes in the late command, unlike desktop, so I'm not sure where this change needs to happen.
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https://code.launchpad.net/~canonical-platform-qa/ubuntu-test-cases/server-preseed/+merge/282346
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