Fix build issue and enum casing bug for Azure Batch

[matthchr]

Description

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• I have read the contribution guidelines.
• The pull request does not introduce breaking changes.

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• Pull request includes test coverage for the included changes.

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• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
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• The *.csproj and AssemblyInfo.cs files have been updated with the new version of the SDK.

The PR for the Swagger for this change is here: Azure/azure-rest-api-specs#2008

[matthchr]

@shahabhijeet - I made some changes to csproj files... which at least for me and my coworkers were required to get things to work locally -- not sure what you guys changed/did to the common include projects but it looks like you turned signing off?

@xingwu1 @darylmsft - This fixes the enum casing bug reported by a few customers.