Report message to the host manager.

async def report(self, msg, timeout=5):
        """Report message to the host manager.
        """
        try:
            host_manager = await self.env.connect(self.host_manager,
                                                  timeout=timeout)
        except:
            raise ConnectionError("Could not reach host manager ({})."
                                  .format(self.host_manager))
        ret = await host_manager.handle(msg)
        return ret