Add verbose flag to the backup-utility

Problem to solve

Currently backup-utility does not have any way to increase the verbosity to see what s3cmd / gsutil commands it is actually using.

Proposal

It would be great to have some additional flag for backup-utility to increase its verbosity. It should make debugging easier for our customers using GitLab helm chart.

Further details

It is possible to get debug output by running bash -x ./usr/local/bin/backup-utility, also modifying the script by adding verbose keys to the utilities used there (gsutil / s3cmd) should help. However, it would be more convenient if one can increase the verbosity of backup-utility using some flags.

Links / references

• good example of the configuration issue where debugging the script helped: #2101 (closed)
• one of our customers is asking about it: internal ZD ticket