RemoveExistingContainers needs better label context on what to remove #3754
Description
Summary
When running several instances / orchestrators, RemoveExistingContainers will remove any running containers that match containerCreatorLabel
To Reproduce
Start an orchestrator with running at least go-livepeer version v0.8.8 (towards GPU:0), wait a bit to get the containers started then start another orchestrator instance running at least go-livepeer version v0.8.8 (towards GPU:1). The first instance will have its ai containers removed.
Expected behavior
The containerCreatorLabel should include a unique identifier such as service addr or local eth addr, which is unique to an orchestrator.