Add HyperV property for AppServicePlan and Site model and deprecating…

[exc3eed]

… IsXenon property

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Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#2065

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Automation for azure-sdk-for-ruby

Nothing to generate for azure-sdk-for-ruby

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Can one of the admins verify this patch?

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Automation for azure-sdk-for-go

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-go#2527

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Automation for azure-sdk-for-java

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-java#2218

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Automation for azure-sdk-for-node

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-node#3267