Add snapshot related new APIs and properties to AKS 2021-08-01 swagger#15586

Merged

ruowan merged 9 commits intoAzure:dev-containerservice-Microsoft.ContainerService-2021-08-01from

chengliangli0918:charlili/snapshotswagger

Aug 12, 2021

Commits on Aug 7, 2021

Add CreationData property to Agentpool level in 2021-08-01 API
charlili1234
committed

Commits on Aug 11, 2021

Commits on Aug 12, 2021

some changes according to ARM team's review comments
charlili1234
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