fedimg needs to tag the AMIs

[sayanchowdhury]

AMIs are uploaded on the nightly basis, both of the compose type production and nightly. It would be good to tag the AMIs appropriately in order to manage them. This would also help deprecating the old AMIs.

More info can be found here

• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html
• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AMIs.html