Add watchdog seconds command

- prints the watchdog chain managed at second boundaries.

tools/gdb/python/main.py

@@ -19,3 +19,4 @@ rtems.rtems_task()
 rtems.rtems_message_queue()
 rtems.rtems_tod()
 rtems.rtems_wdt()
+rtems.rtems_wsec()

tools/gdb/python/objects.py

@@ -15,6 +15,7 @@ class infotables:
     tables_types = {
         'internal/time'          : ('TOD_Control',           '_TOD'),
         'internal/wdticks'       : ('Chain_Control',        '_Watchdog_Ticks_chain'),
+        'internal/wdseconds'     : ('Chain_Control',        '_Watchdog_Seconds_chain'),
 
         'classic/tasks'          : ('Thread_Control',        '_RTEMS_tasks_Information'),
         'classic/timers'         : ('Timer_Control',         '_Timer_Information'),

tools/gdb/python/rtems.py

@@ -245,3 +245,11 @@ class rtems_wdt(rtems_watchdog_chain):
         self.__doc__ = 'Display watchdog ticks chain'
         super(rtems_wdt, self).__init__('rtems wdticks')
 
+class rtems_wsec(rtems_watchdog_chain):
+
+    _class = 'wdseconds'
+
+    def __init__(self):
+        self.__doc__ = 'Display watchdog seconds chain'
+        super(rtems_wsec, self).__init__('rtems wdseconds')
+