Updated OMS data plane to be v. 0.9.0.0-preview

[csuich2]

Updated OMS Data Plane SDK to be version 0.9.0.0-preview for initial release.

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• [not changed] Please add REST spec PR link to the SDK PR
• 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.
• The generate.cmd file for the SDK has been updated with the version of AutoRest, as well as the commitid of your swagger spec or link to the swagger spec, used to generate the code.
• The *.csproj and AssemblyInfo.cs files have been updated with the new version of the SDK.

[csuich2]

@shahabhijeet It looks like the build failed for an unrelated reason yesterday. I restarted it and it looks good now.