Stop LongPolling thread
		
		:return: none

def stopLongPolling(self):
		'''
		Stop LongPolling thread
		
		:return: none
		'''
		if(self.longPollThread.isAlive()):
			self._stopLongPolling.set()
			self.log.debug("set stop longpolling flag")
		else:
			self.log.warn("LongPolling thread already stopped")
		return