add time tick packet script

Ccs/scripts/time_updt.py

+# Periodically send a PUS TC(9,128) time update packet in a background task
+
+import threading
+
+def timetick(period):
+    global t_updt
+    print('START TIMETICK')
+    while t_updt:
+        ObtTime = cfl.get_cuc_now()
+        cfl.Tcbuild('SASW TimeUpdt', ObtTime, pool_name='LIVE', ack=0, sleep=period)
+    print('STOP TIMETICK')
+
+
+PERIOD = 1  # time tick period in seconds
+
+t_updt = True
+t = threading.Thread(target=timetick, args=[PERIOD])
+t.start()
+
+#! CCS.BREAKPOINT
+t_updt = False
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