Renamed drData (and its fields) to diskFileInfo to better reflect the use that we make of that structure

Removed deprecated structures from archiveNS and nameserver namespaces. Removed RetrieveToFileRequest.

Deleted tests for scheduler features that moved to the catalogue.
Factored out the common unit test initialization.

The values are now hardcoded.
Cleanup:
  - Removed object store unit tests for data now in the catalogue.
  - Removed now unnecessary 2nd step addition of retry limits to archive jobs.
  - Removed deprecated ArchiveToFileRequest files.

Changed a few comments and redirected the result of the command line to std::out instead of std::err