updates for LHCbPR
This contains several workarounds that existed in the development branch:
- adapting for LBCORE-1772
- workarounds for slc6 environment
- separation of sending the results to Dirac SE from the handlers call (LBCORE-1690)
- improvements in authentication
- adding cpu and memory info to tests' metadata
- removing obsolete environment setups
Edited by Maciej Pawel Szymanski