xfrd_tcp_set_create
struct xfrd_tcp_set* xfrd_tcp_set_create(struct region* region, const char *tls_cert_bundle, int tcp_max, int tcp_pipeline);
xfrd->tcp_set = xfrd_tcp_set_create(xfrd->region, nsd->options->tls_cert_bundle, nsd->options->xfrd_tcp_max, nsd->options->xfrd_tcp_pipeline);