ElectronLHTool remove "properties " we have not used as such for few years.
requested to merge ATLAS-EGamma/athena:AsgElectronLHTool_rm_old_config_and_properties_from_config into master
The configuration of the Likelihood the last few years (>5) expects a config file. Certain properties are also expected to be present in the config file and read from it always. This simplified a lot of the analysis config back in time.
Before that the user was expected to configure each of them. Since few years even if she does they would have been actually superseeded by the config. Remove the old pre 2014 or so style as it allows also to clean the code a bit.