When SSL jobs get pre-empted, they seem to start from afresh. As a first step, add diagnostics. Print out all checkpoints that are found, to see if a recovered job actually sees the previously written checkpoints [AB#4774](https://innereye.visualstudio.com/60ce1777-00d6-4015-82bc-488a0c00202f/_workitems/edit/4774)
When SSL jobs get pre-empted, they seem to start from afresh.
As a first step, add diagnostics. Print out all checkpoints that are found, to see if a recovered job actually sees the previously written checkpoints
AB#4774