Py-consul

- Add support for python 3.7 and 3.8
- Fix asyncio compatibility to support latest python version
- Remove six dependency
- Use new style of class declaration
- Get rid of py3.4 old compat
- Drop support of deprecated python2
- **base:** allow weights parameter in service register

Base fork

Criteo starts forking this library from [https://github.com/cablehead/python-consul](https://github.com/cablehead/python-consul)


Change log
==========

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* add support for nodemeta to catalog and health end points (thanks
ibrahimmenem)
* update Check.script to use args, as Consul 1.1 has dropped the script
parameter

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* Support for Python 3.4 dropped (sorry)
* Add support for Consul 1.0.0 (thanks matusvalo!)
* Expose all 400 errors and add tests for common callback handler (thanks bagerard)

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* Add header parameter to http check (thanks matusvalo)
* Add basic Transaction HTTP API support (thanks iandyh)
* Fix invalid url error when specifying credentials via host (Issue 167)

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* Add a common base client for shared functionality between different HTTP clients (thanks abn!)
* Fix request quoting issue (thanks abn)
* Fix installation issue due to aiohttp only being available for Python>=3.4.2 (thanks abn)
* Added support for current release of aiohttp (thanks eaterek)
* Improved Tornado example (thanks chriswue)
* Add and use ACL token in Event.fire (thanks illenseer)
* Add client side cert support (thanks brocade-craig)
* Add token params to catalog register (thanks gregdurham)
* Add support for DeregisterCriticalServiceAfter (thanks daroot)
* Improve reliability of test suite (thanks daroot!)
* Update CI: Add py35 and py36 to tests (thanks Poogles)

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Features
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* Add Operator endpoint (thanks bantonj!)