Suppress TTree summary printout

I found this: https://gitlab.cern.ch/lhcb/LHCb/-/blob/master/Kernel/LHCbAlgs/python/LHCbAlgs/Configuration.py#L314-321 which I assume was used for older gaudirun.py style configuration, and includes suppression of TTree printout in the logs. I tried to add it in PyConf.

for DaVinci#201 (closed)

Goes with DaVinci!1136 (merged)