Trying to get ansible-test working on my fedora-28 system, I noticed I
was getting invalid keys from paramiko. It looks like this is because
ssh-keygen is now defaulting to RFC4716 format for private / public
keys.
For now, we can still use PEM based SSH keys, but the long term fix here
is to report a bug to paramiko and support RFC4716 for rsa keys.
Signed-off-by: Paul Belanger <pabelanger@redhat.com>