AthenaCommon: Throw exception on Property parsing errors

Merged Frank Winklmeier requested to merge fwinkl/athena:property_parsing into master

Follow-up from the discussion in yesterday's Gaudi meeting (cc @leggett @akraszna). Set GAUDI_PROPERTY_PARSING_ERROR_DEFAULT_POLICY=Exception environment variable to always throw an exception on property parsing errors. Currently we are using the default "Ignore" (other options would be "Warning" or "Abort").

If this looks OK after full-unit-tests we should probably go with this setting in athena.

Relates to gaudi/Gaudi#163 (closed).

Edited by Frank Winklmeier

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