Problem: duplication in *_event methods across subclasses of stream_connecter_base_t

Solution: pull up common code, introduce new create_engine function in base class

src/tipc_connecter.hpp

@@ -58,9 +58,7 @@ class tipc_connecter_t : public stream_connecter_base_t
     };
 
     //  Handlers for I/O events.
-    void in_event ();
     void out_event ();
-    void timer_event (int id_);
 
     //  Internal function to start the actual connection establishment.
     void start_connecting ();