add partitioning for LHCbPR directory on grid se
This is done to mitigate too large (currently over 40k) directory with zip files with the results of LHCbPR tests. EOS team introduced a protection against such cases. This led to inability of listing LHCbPR directory.
See https://gitlab.cern.ch/lhcb-core/LHCbPR2GET/merge_requests/12
Edited by Maciej Pawel Szymanski