Rover: reduce scheduler estimated time for gcs tasks

APMrover2/APMrover2.cpp

@@ -59,9 +59,9 @@ const AP_Scheduler::Task Rover::scheduler_tasks[] = {
     SCHED_TASK(update_mission,         50,    200),
     SCHED_TASK(update_logging1,        10,    200),
     SCHED_TASK(update_logging2,        10,    200),
-    SCHED_TASK(gcs_retry_deferred,     50,   1000),
-    SCHED_TASK(gcs_update,             50,   1000),
-    SCHED_TASK(gcs_data_stream_send,   50,   3000),
+    SCHED_TASK(gcs_retry_deferred,     50,    500),
+    SCHED_TASK(gcs_update,             50,    500),
+    SCHED_TASK(gcs_data_stream_send,   50,   1000),
     SCHED_TASK(read_mode_switch,        7,    200),
     SCHED_TASK(read_aux_all,           10,    200),
     SCHED_TASK_CLASS(AP_BattMonitor,      &rover.battery,          read,           10,  300),