Resources: support api version when listing generic resources

[xseeseesee]

fix #978

[weidongxu-microsoft]

Looks OK. Though it might be a bit concern that we do an extra request only for some user case that need the apiVersion (maybe more cases will not need it).

[xseeseesee]

Looks OK. Though it might be a bit concern that we do an extra request only for some user case that need the apiVersion (maybe more cases will not need it).

For users who want to do some update operation, it's not extra request as they will need apiVersion. For others, they can avoid the extra request by not using resource.apiVersion().

[weidongxu-microsoft]

Nice. It is lazy evaluation. So no cost if no use.

[xseeseesee]

/azp run

[azure-pipelines]

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