restore MDT conditions algorithm to Run 2 logic for MC

This updates the functions called to create the MDT conditions algorithm so that they reproduce the Run 2 logic in Monte Carlo. In particular loadMcNoisyChannels and loadMcDroppedChambers did not parse the database content correctly, and resulted in accesses to uninitialized memory (one of which is now protected here).

This MR resolves valgrind errors seen in the q221 RDOtoRDOTrigger step.