Helper method for creating a connection to an ``address``.

async def create_datagram_endpoint(self, protocol_factory=None, **kw):
        '''Helper method for creating a connection to an ``address``.
        '''
        protocol_factory = protocol_factory or self.create_protocol
        _, protocol = await self._loop.create_datagram_endpoint(
            protocol_factory, **kw)
        event = protocol.event('connection_made')
        if not event.fired():
            await event.waiter()
        return protocol