[Merge] lp:~smoser/ubuntu/trusty/cloud-init/trusty-1461242 into lp:ubuntu/trusty/cloud-init

[Ben Howard]

Review: Approve

Tested and okay for merger. It works as expected by creating ed25519 keys in /etc/ssh. 

I would merge it, but bzr is complaining of a "readonly transport."
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https://code.launchpad.net/~smoser/ubuntu/trusty/cloud-init/trusty-1461242/+merge/270711
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