This decouples the "cta-admin tf ls" command from looking up path names
in the catalogue, paving the way to remove the path from the DB.

1. Needs to be sys.* so users can't change it
2. Should not be confused with sys.retrieve.req_id

Renames CTA_ArchiveFileID to sys.archive.file_id
Renames CTA_StorageClass to sys.archive.storage.class

Wrong parameter was passed as retrieve request id.
Added logs to frontend.
Implemented validation of cancel in archive retrive test (no file should be retrieved).

Also improved function name to better match XRootd names.

The retrieve request address is now stored in the EOS namespace as an extended attribute and deleted
after checks on cancellation. The cleanup of the queues will be eventually done by the tape servers.

Google protobuf3 logs a FATAL error if .at() is called for a
non-existent key, so the log is filled with errors if we use try {}
catch(...) {}

Added mount policy to the Repack Request

If this option is used, then the bufferURL provided to the repack request will be the one specified. Otherwise, the repack buffer URL will be the one from the cta-frontend-xrootd.conf file

command.

Implement cta-admin disksystem ch command.

Implement cta-admin disksystem add/ls/rm commands.

tapes

Add read-only tape flag support in the catalogue for the TAPE table.
Add RdbmsCatalogue::setTapeReadOnly method to modify this flag with
  "cta-admin tape ch" command.
Add RdbmsCatalogue::setTapeReadOnlyOnError to set this flag from taped.
Add support for rdonly flag listing for "cta-admin tape ls" and
  "cta-admin sq" command.

The blob is a set of type/value pairs which can be serialised to a byte
array for storage in the DB.

The blob is a set of type/value pairs which can be serialised to a byte
array for storage in the DB.

All text formatting is now client-side.

cta-admin logicallibrary ls
cta-admin mountpolicy ls
cta-admin showqueues
cta-admin storageclass ls