[TA] change rolebinding create command parameter roles to comma-seperated

[YitongFeng-git]

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[YitongFeng-git]

LGTM

Please also update history.rst (and setup.py if you want to release a new version) and add some description about the change.

Also, since the feature is basically available, time to add a live test case for it?

Updated history, and the tests will be added in August.

[yonzhan]

AKS

[FumingZhang]

/azp run

[azure-pipelines[bot]]

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