fix pylint

Author: RandySheriffH

ci_build/azure_pipelines/pylint.yml

@@ -10,5 +10,6 @@ jobs:
           set -ex
           pip install pylint
           pip freeze
+          set PYTHONHOME=%PYTHONHOME%;tf2onnx;tests
           pylint --rcfile=tools/pylintrc --ignore=version.py --disable=cyclic-import tf2onnx tests/*.py tools -j 0
         displayName: 'Pylint'