* Add isort_code.sh to sanity tests
* Run tools/distrib/isort_code.sh
* Fine tune the import order for relative imports
* Make pylint and project generation happy
* Fix a few corner cases
* Use --check instead of --diff
* The import order impacts test result somehow
* Make isort print diff and check output at the same time
* Let tools/run_tests/python_utils be firstparty library
* Run isort against latest HEAD
* Remove Python 2.7 binary wheels
* Make sure pip won't pick-up newer versions
* Attempt to fix the distribtest
* Fallback to virtualenv==16.7.9 for 34 and 35
* Remove 34 from binary wheel distribtests
* Add grpcio-csds pacakge
* Remove unused file
* Fix the proto import path issue
* Update the CSDS package and xds-protos for PY2
* Make tests happy
* Fix Bazel proto dependency
* Add Python2 tests for CSDS
* New Python package xds_protos
* Polish the setup.py
* Adding install requirements and improve wheel validation
* Add xds-protos to the update procedure of envoy-api
* Add setup requirements