Added logging for case where route hint is to slave.

server/modules/routing/readwritesplit/readwritesplit.c

@@ -1138,6 +1138,12 @@ static route_target_t get_route_target (
                                                 (char *)hint->data)));                                        
                                 }
                         } 
+                        else if (hint->type == HINT_ROUTE_TO_SLAVE)
+                        {
+                                LOGIF(LT, (skygw_log_write(
+                                        LOGFILE_TRACE,
+                                        "Hint: route to slave.")));                                
+                        }
                         hint = hint->next;
                 } /*< while (hint != NULL) */
         }