Register SIGTERM/SIGINT signal handlers with the ioloop to fini this object.

async def addSignalHandlers(self):
        '''
        Register SIGTERM/SIGINT signal handlers with the ioloop to fini this object.
        '''

        def sigterm():
            print('Caught SIGTERM, shutting down.')
            asyncio.create_task(self.fini())

        def sigint():
            print('Caught SIGINT, shutting down.')
            asyncio.create_task(self.fini())

        loop = asyncio.get_running_loop()
        loop.add_signal_handler(signal.SIGINT, sigint)
        loop.add_signal_handler(signal.SIGTERM, sigterm)