Fix Issue: Add log to fix issue TC_GEONW_PON_SQN_BV_01 invalid speed

ttcn/GeoNetworking/LibItsGeoNetworking_Templates.ttcn

@@ -1763,6 +1763,8 @@ module LibItsGeoNetworking_Templates {
             }
             
             function f_getDelta15(Int32 p_value, integer p_delta) return template (present) Int15 {
+              log(">>> f_getDelta15: ", p_value, ", ", p_delta); // FIXME To be removed when issue https://forge.etsi.org/rep/ITS/ITS/issues/13 will be clause
+              
                 if (p_value == c_int15Min) {
                     return (p_value .. p_value+p_delta);
                 }