Fix the missing password auth config in sshpiper config
In ssh-proxy config, any user not in a migration group, like gpfs5, for example, is matched by username: ".*", which acts as a default group for non-matching users.
In the current config, we defined the rule with only key-based authn but missed password authn. We need to add it to ssh-proxy via ansible. The code change happens in the template ansible/roles/ssh_proxy_config/templates/sshpiperd.yaml.j2