gfal2 2.16.4

Bug

• [DMC-1173] - The xrootd plugin ignores the make parent option

Task

• [DMC-1159] - Implement Xrootd prepare evict on sources when Xrootd TPC transfers succeed
• [DMC-1160] - Remove conditional compilation code to still support xrootd v3 on xrootd plugin
• [DMC-1166] - Add support for canceling HTTP TPC transfers