In FIPS mode, using RSA keys for ssh is fine as long as SHA-1 is
not used for the signature algorithm. Unfortunately, the version
of cirros used in OpenStack CI does not have a version of dropbear
that supports SHA-2 signatures. So, any connections from a FIPS
enabled machine will fail as the cirros instance will only support
ssh-rsa (SHA-1 signatures).
To get around this, we add a new option to specify the key type
(validation.ssh_key_type). This will allow the addition of other
key types in future if needed.
Tempest now supports 'rsa' and 'ecdsa' key types.
We also add a fips job to the experimental queue to test the usage
of the new key type.