Polling is set to False in generated vendored sdk so long running operations do not work

[hivyas]

When generating an Azure cli extension the vendor sdk makes polling=False so that even when sdk_no_wait is False, long running operations don't complete.

This is the readme.az.md I am using to generate:

az:
    extensions: videoanalyzer
    namespace: azure.mgmt.videoanalyzer
    package-name: azure-mgmt-videoanalyzer
az-output-folder: $(azure-cli-extension-folder)/src/videoanalyzer
python-sdk-output-folder: "$(az-output-folder)/azext_videoanalyzer/vendored_sdks/videoanalyzer"

And the rest api specs can be found here