TrigEDMConfig: fix L1_eTauBDTRoI Aux item and improve unit tests

The unit tests were useless for many cases because errors were not being checked and the test return code was often 0 despite error.

• add missing Aux. to L1_eTauBDTRoI
• return failure code when printing an error
• use noerror.sh
• add a check to ensure Aux follows non-Aux container (if this is violated we are writing data that cannot be deserialized because our Deserialiser has an implicit assumption on the order of the containers: Interface, Aux, dynAux)

@tamartin @okuprash