Bugfixes
- Scaler creates the proper change key for checking if service updaters are ready and account for system changes
- De-dup environment variables that Scaler already manages ie. SERVICE_API_HOST
- Changes to Update Sources should be possible regardless of how they're persisted (ie. datastore vs disk)
- Fix bug in synchronizing update sources code in API
- Source/Service deletion will clear caching entries in Redis for running updates. So even if done by accident, it should be possible to update right away
- Local source changes (such as default classification) should trigger updaters to perform a local update