[Python] Fix serialization name for multipart - #3274

[Python] Fix serialization name for multipart#3274

Yuchao Yan (msyyc) merged 3 commits into

mainAzure/autorest.python:mainfrom

auto-microsoft-python-multipart-fix-serialization-nameAzure/autorest.python:auto-microsoft-python-multipart-fix-serialization-nameCopy head branch name to clipboard