If CHECKSUM_BLOB is NULL, the code will fall back on CHECKSUM_ADLER32.

[REPACK] Added a failed to create archive request counter so that the Repack Request is complete or failed if Retrieve subrequest is failed (creation or execution)

kill. This is quite likely for cta-taped as its static memory buffer
consume a lot of memory.

Added the new method Rset::isEmpty() - I am guessing that the migration work of Michael would have loved to have had this method

Fixed various issues detected in the process.

The sleep time (15 minutes) is currently hardcoded, but implemented in a single place (OStoreDB::fetchMountInfo() ).

The process can now indicate the agent structure can be garbage collected, saving a wait for a timeout. This
is typically hapenning when archive jobs need requeueing after a session hits the end of the tape.

Started the strcutures needed for sleeping a retrieve queue.

Old SRPM is now cleaned up.
We automatically fetch all existing repos from the docker tree.
Fixed package version.

Upgraded to EOS 4.5.3-20190730172748gitea30da3 in order to get the new exception logs from the GrpcNsInterface::FileInsert() and GrpcNsInterface::ContainerInsert() methods

The disk system is now vetoed for the duration of a mount if we fail to reserve free space.

cta-catalogue-schema-create will now start storage class IDs for Oracle databases at 4294967296 in order to avoid clashes with CASTOR

Moved the space reservation information to the DriveStatus object store object instead of a new central registry.
The central registry would have been a single point of contention as was the DriveRegistry before being split into
DriveStates. As the problem is so close to the one of the drive status, we can actually reuse the drive status for this purpose.

The algorithm will also change as we move the responsibility of querying the free space from the disk systems into the OStoreDb
object instead of the Scheduler. This leads to a slightly worth layering of responsibilities, making the OStoreDb::RetrieveMount
object a client of the disk::DiskSystemFreeSpaceList object.

The current implementation will also query the free space from the disk systems on each pop, instead of doing so in a globally
cached fashion. With the new model, we could cache the free space per drive (if needed), but not globally. This is not expected
to be a real issue and free space is a global counter in the disk system, expected to be readily available.