Add MainEvgenServicesCfg method

John Derek Chapmanrequested to merge
jchapman/athena:EvgenCAServices_master into master

MainEvgenServicesCfg is the ComponentAccumulator-based equivalent of:
import AthenaCommon.AtlasUnixGeneratorJob

NB Must have set ConfigFlags.Input.RunNumber and ConfigFlags.Input.TimeStamp before calling MainEvgenServicesCfg to avoid attempted auto-configuration from an input file.

Edited by John Derek Chapman

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