[pkgdb] gfal2-plugin-xrootd summary updated by limb

[Fedora PackageDB]

limb set package gfal2-plugin-xrootd summary to Provide xrootd support for GFAL2

To make changes to this package see:
  https://admin.fedoraproject.org/pkgdb/acls/name/gfal2-plugin-xrootd