athenaHLT: Add option to dump job properties into JSON file

Frank Winklmeierrequested to merge
fwinkl/athena:athenaHLT_dumpjo into master

Add the --dump-config command line flag to athenaHLT.py, which allows to dump the jobproperties into a JSON file. This currently relies on the (old-style) ConfigurableShelve mechanism to dump the configuration into a pickle file.

Added TrigConfIO.JsonUtils as a module to collect JSON related trigger configuration modules (cc @mark @stelzer)

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