Detects if a systemd service is enabled or not.

def is_systemd_service_enabled(conn, service='ceph'):
    """
    Detects if a systemd service is enabled or not.
    """
    _, _, returncode = remoto.process.check(
        conn,
        [
            'systemctl',
            'is-enabled',
            '--quiet',
            '{service}'.format(service=service),
        ]
    )
    return returncode == 0