[tapeserver] In the case the DiskWriteTask for a file fails, the log contains its size and its checksumblob

Fixed bug in previous commit by returned xrootd-ssi-protobuf-interface sub-module to it's original commit

[cta-admin] Corrected the showqueues command in the case ArchiveForUser and ArchiveForRepack exist for the same tapepool

Fixed.

The log message "OStoreDB::fetchMountInfo(): fetched a retrieve queue" is now displayed only if the fetch lasts more than 1 seconds

Otherwise yum priorities plugin will ignore them

The default `prepareImage.sh` will create an image with cern-only repositories inside. Run `prepareImage.sh public` to use another dockerfile, that forces package installation from public sources.

This new build method allows to remove the *complex* `rename:dockerimage` stage.

[cta-taped] The MaintenanceProcess can be disabled via its configuration file (DisableMaintenanceProcess)

[repack] Corrected the problem of Agent ownership removal for repack request and repack sub-requests