Comment 2 for bug 1869277

fwiw, changing this may well break things.

Anything that is reading the output of a log in order to get ssh keys would be expecting lines to start with ec2. So...while that unfortunately isn't 'cloud-init' or 'azure', it *is* what users expect.

I'd leave it as it is.
The keys are written in a more machine friendly way also. See bug 893400