Backup Daemon should check for the available filesystem before starting a groom job
When a groom job starts, it might get stuck or fail if the available disk space is not enough to copy all live blocks to another directory.
It would be helpful if the Backup Daemon checks the available disk space before starting a groom job, and notifies the user:
1. via Ops Manager UI
2. report it in the logs
3. sends an alert that the upcoming/scheduled groom job would not start due to low disk space.