Compute 2021-07-01 REST API version change

[grizzlytheodore]

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Swagger PR adding 2021-07-01 version: Azure/azure-rest-api-specs#15479

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Old outstanding PR cleanup

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[archerzz]

There are some comments we need to resolve (most are about interface backward compatibility), before we can merge it. Thanks.

[archerzz]

@Sandido @grizzlytheodore You're right. Codes under Generated cannot be changed, and they could be worked around under Customization. All comments are resolved. Thanks.