Avoid recopying ~/.ssh/* during bootstrap/linux.
Avoid recopying ~/.ssh/* during bootstrap/linux.

Check for presence of ~/.bindle/home/.ssh/authorized_keys, since this is
typically the only file in ~/.ssh on a fresh ubuntu install and it would
only be present in ~/.bindle after ~/.ssh/* has already been copied.

alphabetum/dotfiles,alphabetum/dotfiles,alphabetum/dotfiles,alphabetum/dotfiles