Add support for messagepack

[lovasoa]

The preferred response format for InfluxDB is now MessagePack, for reasons listed in influxdata/influxdb#8330 .
Supporting it and using it by default when the server supports it too would solve several open issues, such as #665 and #715. It would also improve performance, and lower the required amount of data to be transmitted between the server and the client.

[philip-jones]

I fully support that, but I think JSON vs MessagePack is a completely separate issue to whether the HTTP POST to InfluxDB is gzip'd or not, so perhaps don't conflate the two issues or get sidetracked from implementing gzip support in influxdb-python.

Gzipping will benefit either transfer format.

[lovasoa]

To be clear: message pack is used only from the server to the client. gzip is less useful on msgpack-encoded data since it has a high entropy, but it would definitely help for POST data sent from the client to the server.

[philip-jones]

Sorry folks, probably posted my comment on the wrong issue, should have been on #718 not this one.

[http600]

ya, but how to make server return in json