* Set up Circleci workflow
* Update python tag
* Add pre-test job to cache the requirements
* Upgrade pip itself
* Use 3.7 for lint
* Parallelize pylint
* Tweak run gen_requirements_all
* tweak cache key
* Add circleci support
* Add buildpack-deps
* Install libudev-dev
* sudo
* always run test
* Add test report
* no sugar
* quite pytest
* better junit test result
* Add $CODE_COVERAGE env var