Fix the development status classifier to be consistent with 'alpha' in the README.


Also fixes some docs related kokoro configs. The `docs/docs.cfg` job that is triggered by successfulrelease jobs was failing because `NOX_SESSION` was in the required env vars list.

fix: update paging implementation to handle unconventional pagination
fix: don't use integers for enums in json encoding
fix: stabilize order of query_params

🤖 I have created a release \*beep\* \*boop\* 
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## [0.2.0](https://www.github.com/googleapis/python-compute/compare/v0.1.0...v0.2.0) (2021-02-11)


### Features

* run synthtool to pick up mtls feature ([#6](https://www.github.com/googleapis/python-compute/issues/6)) ([3abec21](https://www.github.com/googleapis/python-compute/commit/3abec21a1d5b1384779c48b899f23ba18ca0ddb3))


### Bug Fixes

* don't use integers for enums in json encoding ([a3685b5](https://www.github.com/googleapis/python-compute/commit/a3685b5a03a75256d2d00b89dcc8fda34596edde))
* fix body encoding for rest transport  ([#17](https://www.github.com/googleapis/python-compute/issues/17)) ([a3685b5](https://www.github.com/googleapis/python-compute/commit/a3685b5a03a75256d2d00b89dcc8fda34596edde))
* regenerate the client lib ([#9](https://www.github.com/googleapis/python-compute/issues/9)) ([b9def52](https://www.github.com/googleapis/python-compute/commit/b9def52a47067804d5b79e867fb3ff895f8f4c21))
* set development status classifier to alpha ([#2](https://www.github.com/googleapis/python-compute/issues/2)) ([54814f8](https://www.github.com/googleapis/python-compute/commit/54814f8ad15b8f8dff051c7c7819bc4a7b8e099f))
* stabilize order of query_params ([a3685b5](https://www.github.com/googleapis/python-compute/commit/a3685b5a03a75256d2d00b89dcc8fda34596edde))
* update paging implementation to handle unconventional pagination ([a3685b5](https://www.github.com/googleapis/python-compute/commit/a3685b5a03a75256d2d00b89dcc8fda34596edde))
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