Activate S3 Sidecar

[ric-evans]

Since we are separating the scanner's central server and client starter (Observation-Management-Service/ewms-task-management-service#2), there will be no shared file space to transfer the startup.json file. To remedy this, while retaining backward compatibility, replace the clientmanager with a "S3 Sidecar" container. This will do one thing, wait for the file then upload it. It can use a small fraction of a CPU.

This can happen now, in v1 -- no need to wait for TMS.