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This reverts commit f9249bb1.

Added drive status reporting in scheduler
Added drive status reporting in OStoreDB
Added support for drive status listing in the front end
Removed virtual functions from the Scheduler, which is never overloaded.
Added DesiredDriveState structure to drive state.
Removed usage of duplicate MountType, DriveStatus and DriveState structures.
Created DriveInfo structure to allow recreation of drive register entry in all
reporting situation (potentially with partial/assumed info).

cta::server::ProcessCap

Added new functions allowing representation of the full life cycle of the tape sessions.
Phased out the first old function (gotArchiveJobFromCTA).
Removed some dead code.

This reverts commit 2dc2976e.

Conflicts:

	scheduler/CMakeLists.txt

Introduced the scheduler to the DataTransferSession, replacing the concept of DGN with logical library

Removed the classes responsible for implementing the RTCOPY protocol from the CTA version of tapeserverd

Renamed CTA/tapeserver/castor to CTA/tapeserver/castor_checkout in preparation for the moving the sub-directory CTA/tapeserver/castor/castor up the directory tree

The ProcessForker can impose "entire lifetime" or "per mount"
refreshes of CASTOR configuration-parameters.  There is no
need for the tapeserverd parent process to do this and send
the results over the wire.

The C++ namespace castor::tape::tapeserver::drive now matches its
directory structure.

Tapeserverd now support file://, root:// rfio:// and radosStriper:// URLs, on top of heuristic protocol guessing from the hostname:[/]path synthax.
The rados striper version is not yet fleshed out yet.
The xroot client used for this is the latest object oriented client (XrdCl::File).