Changed the signature of the ArchivalRoute to include CreationLog and adapter the using classes accordingly.

Aded new unit test MockSchedulerTest/SchedulerTest.archive_to_new_file_as_admin which currently fails

Covered createStorageClass and createArchivalRoute so far.
Added HOST column in most tables of the SQLite schema.

Created a CreationLog struct on the scheduler side and used it in the OStoreDB's interface for simplification.

Further implemented OStoreDB.

Created a wrapper class for the couple Backend+OStoreDB as the unit tests expect a clean DB each time.

Added function to return the copy No. of RetrieveFromTapeCopyRequest and added the corresponding cpp in the CMakeLists.txt

Simplified the UserIdentity and CreationLog structures in the object store to match the SchedulerDatabase's.

Before this commit the Scheduler class would call

  SchedulerDatabase::queue(const ArchiveToFileRequest &)

in a loop when handling a user request to archive multiple remote files
to a directory in the archive.  This modification opens the door for the
SchedulerDatabase object to remember more about the context of each
archive request.  In this case which archive to directory request was at
the origin of each of the corresponding archive to file requests.