[Merge] ~mwhudson/ubuntu-seeds/+git/ubuntu:remove-ssh-import-id into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:mantic

[Steve Langasek]

Review: Needs Information

Was ssh-import-id installed by default on servers before this bug?  Will removing it from this seed cause it to be missing for users who do install the ssh server?
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https://code.launchpad.net/~mwhudson/ubuntu-seeds/+git/ubuntu/+merge/451769
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