Add autoscaling support for the Store Gateways

[bcbrockway]

trafficstars

As per subject! Not sure what else needs to be said other than that we'd love to see support for this and would be willing to contribute if it's something you agree with.

[nschad]

go 4 it!

[stale[bot]]

This issue has been automatically marked as stale because it has not had any activity in the past 30 days. It will be closed in 15 days if no further activity occurs. Thank you for your contributions.