template for action known-hosts use invalid identifier for rsa key

Summary

template for action known-hosts use invalid identifier for rsa key, which cause keys to not work when using rsa keys

Expected behavior

{{ host.identifiers|join(',') }} ssh-rsa {{ host.rsa_key }}

Actual behavior

{{ host.identifiers|join(',') }} id-rsa {{ host.rsa_key }}

Possible fixes

change id-rsa to ssh-rsa