The report packer should now also be referenced in the tape recall thread, so it can report the drive status.
testingMocks/MockRetrieveMount.hpp needs to be improved so it handles les end of session correctly.
Then the mechanism has to be mirrored in Archives (simpler case).

Adjusted unit test to accomodate the new structure (SchedulerDatabase::RetrieveMount is now a pure virtual class).

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

errors for a non-crashing session can also be recorded as a failures in the
tape log.

CASTOR-4765: The heartbeat messages of the data-transfer session of tapeserverd should include valid drive unit-names

Partial implementation of the ticket:
- The reporting to client and session exit part has been dismantled.
- The template based implementation of the watchdog has been changed to a more classing inheritance schema.
- The reporting to mother process of the moved blocks has been re-enabled.

TaskWatchDog is now template, can detect when the drive is stuck and ask the right report packer to report that file as wrong, close the session and kill the whole process

Added a bunch of comments for MigrationTaskInjector,MigrationReportPacker, RecallTaskInjector and DataFifo

Thus, The real reporters do not inherit publicly from it => Changed all the lines of coded that had to be changed

Compute it on DiskWriteTask and report it to the Client. Tests and interfaces have changed consequently

Changed consequently the types to use the interface instead of the derived type : RecallReportPacker

ReportEndofSession(WithErrors)::goingToEnd returns now true as it should and RecallReportPacker.M-terminate has been removed by goingToEnd+break if true

Moved all files related to Client to client/, changed the namespace and fixed the files consequently (header,usings,...)

log, client interface and m_listReports are now inherited from the base class

We are now using the matching files and classes frpm castor/tape/threading