https://blueprints.launchpad.net/nova/+spec/allow-special-characters-in-keypair-name
Allowing the '@' and '.' (dot) characters in keypair names will improve
end user experience, as some already try to input names in format user.name@host.
The default comment generated by ssh-keygen that users also try to use,
is also in this format.
APIImpact
Implements: blueprint allow-special-characters-in-keypair-name
Change-Id: I1333842fbac00574887fd1bfe699c8e4185fd334
16fbb837d5