Datadog

* [Added] [statsd] Add ability to toggle `statsd.disable_buffering` state during runtime. See [700](https://github.com/DataDog/datadogpy/pull/700).
* [Added] Add a dogshell option to change Datadog site to call API. See [691](https://github.com/DataDog/datadogpy/pull/691).
* [Fixed] [statsd] Fix dedicated-endpoint telemetry shipping when used with UDP. See [690](https://github.com/DataDog/datadogpy/pull/690).
* [Changed] [statsd] Disable statsd buffering by default. See [692](https://github.com/DataDog/datadogpy/pull/692).
* [Changed] [statsd] Always terminate packets with newline. See [685](https://github.com/DataDog/datadogpy/pull/685).
* [Changed] [statsd] Enable buffering by default for statsd. See [670](https://github.com/DataDog/datadogpy/pull/670).
* [Changed] [statsd] Add caching to tag normalization for Python3.2+. See [674](https://github.com/DataDog/datadogpy/pull/674).

* [Fixed] Remove unused decorator dependency. See [651](https://github.com/DataDog/datadogpy/pull/651).
* [Fixed] [dogstatsd] Fix unicode handling of event text. See [661](https://github.com/DataDog/datadogpy/pull/661).
* [Added] [dogstatsd] Improve tag normalization speed. See [672](https://github.com/DataDog/datadogpy/pull/672).

* [Fixed] Fix decorator dependency for Python 2.7. See [646](https://github.com/DataDog/datadogpy/pull/646). Thanks [artem888881](https://github.com/artem888881).
* [Fixed] [dogstatsd] Fix buffer operation thread-safety. See [642](https://github.com/DataDog/datadogpy/pull/642).
* [Fixed] [dogstatsd] Improve performance of telemetry serialization. See [641](https://github.com/DataDog/datadogpy/pull/641).

* [Fixed] Fix blocking connections in dogstatsd. See [634](https://github.com/DataDog/datadogpy/pull/634).

* [Added] Support DD env vars in threadstats. See [625](https://github.com/DataDog/datadogpy/pull/625).
* [Added] Add logs listing feature. See [622](https://github.com/DataDog/datadogpy/pull/622). Thanks [userlocalhost](https://github.com/userlocalhost).
* [Added] [telemetry] optionally decouple telemetry destination from other metrics. See [558](https://github.com/DataDog/datadogpy/pull/558).
* [Fixed] Lazy log formatting. See [628](https://github.com/DataDog/datadogpy/pull/628).
* [Fixed] Turn EAGAIN warning into debug. See [629](https://github.com/DataDog/datadogpy/pull/629).
* [Fixed] Turn warning into info. See [623](https://github.com/DataDog/datadogpy/pull/623).
* [Fixed] [dogstatsd] use monotonic clock source when available for timers. See [615](https://github.com/DataDog/datadogpy/pull/615). Thanks [jd](https://github.com/jd).
* [Fixed] Fix Synthetics delete_test parameter name. See [603](https://github.com/DataDog/datadogpy/pull/603). Thanks [jonathan-hosmer](https://github.com/jonathan-hosmer).
* [Fixed] Delay creation of lambda ThreadStats. See [609](https://github.com/DataDog/datadogpy/pull/609).

* [Added] Add environment variable to disable statsd metric collection. See [589](https://github.com/DataDog/datadogpy/pull/589). Thanks [dgzlopes](https://github.com/dgzlopes).
* [Added] [dogstatsd] Add support for distribution context manager and decorator. See [581](https://github.com/DataDog/datadogpy/pull/581). Thanks [dnlserrano](https://github.com/dnlserrano).
* [Added] [dogstatsd] sock.setblocking(0) for UDP socket. See [590](https://github.com/DataDog/datadogpy/pull/590).
* [Added] [dogstatsd] Add type information to some dogstatsd methods. See [579](https://github.com/DataDog/datadogpy/pull/579). Thanks [vishalkuo](https://github.com/vishalkuo).