loop over command names in main
loop over command names in main

This reduces some duplication in the big triage statement in main, but
the important benefit is that we can tell when peru is invoked without
any command, and we can print help in that case instead of printing
"peru.yaml not found".

olson-sean-k/peru,olson-sean-k/peru,scalp42/peru,ierceg/peru,buildinspace/peru,enzochiau/peru,nivertech/peru,buildinspace/peru,nivertech/peru,ierceg/peru,scalp42/peru,oconnor663/peru,oconnor663/peru,enzochiau/peru