Failure to retrieve checksums from some pillars should generate a stderr output

Calling the getchecksums.sh operation will currently fail silently if some of the pillar fails to respond or return as failure response. This should be directly visible in the console.

Note the failure is visible in the log.

All operations should be checked to see that they display a single line in the console for each component failing to respond correctly. Note that this also included avoiding dumping stack traces or full exception dumps to the console.

There might be different degrees of output:

• Idempotent put: sbdisk already had the correct file.
• Get: sbdisk didn't have the relevant file.