Add missing CDistributedSmoothNodeBase import

direct/src/distributed/DistributedSmoothNodeBase.py

@@ -3,6 +3,7 @@
 from ClockDelta import *
 from direct.task import Task
 from direct.showbase.PythonUtil import randFloat, Enum
+from panda3d.direct import CDistributedSmoothNodeBase
 
 class DummyTaskClass:
     def setDelay(self, blah):