single term ack counting mechanism for every socket (no separate mechanisms for fq_t and lb_t)

src/sub.cpp

@@ -49,17 +49,10 @@ void zmq::sub_t::xattach_pipes (class reader_t *inpipe_,
 
 void zmq::sub_t::process_term ()
 {
-    register_term_acks (1);
     fq.terminate ();
-
     socket_base_t::process_term ();
 }
 
-void zmq::sub_t::terminated ()
-{
-    unregister_term_ack ();
-}
-
 int zmq::sub_t::xsetsockopt (int option_, const void *optval_,
     size_t optvallen_)
 {