[python] fix bugs for imports and pylints for packages with only internal models - #3201

[python] fix bugs for imports and pylints for packages with only internal models#3201

Yuchao Yan (msyyc) wants to merge 7 commits into

mainAzure/autorest.python:mainfrom

auto-iscai-msft-python/internalOnlyModelsAzure/autorest.python:auto-iscai-msft-python/internalOnlyModelsCopy head branch name to clipboard