Revert the previous change: remove the identity properties

[xiadu94]

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[azuresdkci]

Can one of the admins verify this patch?

[djyou]

@jianghaolu This is to revert a previous PR that was merged before the server side is ready. #4074
/cc @sajayantony

[djyou]

Please add a meaningful title

[sajayantony]

LGTM

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[sergey-shandar]

@xiadu94 @djyou what's the reason to remove the properties? This's stable API and some SDKs could be already published as stable with the properties.

[djyou]

@sergey-shandar There is no breaking change yet.

This is to revert a previous PR that was merged before the server side is ready. #4074

[sergey-shandar]

@djyou as I mentioned before, removing properties from master branch in a stable API is potential breaking changes. But if the server side is not ready, I will merge the PR.

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