Converts DNSClientConfiguration to ExportedDNSClientConfiguration.

def Convert(self, metadata, config, token=None):
    """Converts DNSClientConfiguration to ExportedDNSClientConfiguration."""
    result = ExportedDNSClientConfiguration(
        metadata=metadata,
        dns_servers=" ".join(config.dns_server),
        dns_suffixes=" ".join(config.dns_suffix))
    yield result