Implemented CA-based configuration for AthenaMP

Vakhtang Tsulaiarequested to merge
tsulaia/athena:master-mpca into master

Introduced AthenaMPConfig.py script with the CA-based configuration for AthenaMP. Also introduced a bunch of MP-specific configuration flags, and a new flag for setting MaxFilesOpen property of PoolSvc, which needs to be modified when AthenaMP runs with the Shared Reader

Edited by Tadej Novak

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