Add connection=local to default hosts file

[etsauer]

Current hosts file:

[seed-hosts]
localhost

When using localhost as the seed-host, we want to prevent ansible from trying to perform a remote ssh connection to our local machine. The default hosts file should look like this:

[seed-hosts]
localhost ansible_connection=local

[jacobsee]

ansible_connection: local is currently being configured in host_vars/localhost.yml. Do you think it should be moved to the hosts file instead?