Which Sitecore and Azure SDK version supports swap option as shown in the screenshot below
This is something I have been using since Sitecore Azure version 2 at least. It's my understanding that having a production and a staging slots is one of the original features of Azure Cloud services. So even without having tested all of them I'm going to say: It's available on all Sitecore Azure versions.
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2Adding a footnote that Sitecore Azure is retired and discontinued as of Sitecore 8.2. Utilization of Azure Web Apps natively is supported as of Sitecore 8.2 Update 1. – Pete Navarra Dec 23 '16 at 20:24