Fix FileStager errors triggered by LCG_94

Ben Couturierrequested to merge
fix-stagediomanager into master

The test error is due to a SEGFAULT in Tools/FileStager/src/Component/StagedIODataManager.cpp.

  • Replace xrd with xrdfs
  • StagedIODataManager: add property to disable PFN warning (warning disabled by default) and modernize properties.
Edited by Marco Cattaneo

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