Updated COS util

[blumenstiel]

What changes were proposed in this pull request?

• Removed dummy operator
• Updated cos util (moved to python script, renamed operations to upload and download, and added relative paths to sync operations)

[blumenstiel]

@romeokienzler I think that the automated build is not working. After approval, we need to updated the container image manually.

[romeokienzler]

thanks @blumenstiel

merged