t/passfailtest.do: just return exit codes, don't print messages.
t/passfailtest.do: just return exit codes, don't print messages.

The exit code numbers are useful enough, and the messages are the sort of
thing that might turn into lies eventually.

apenwarr/redo,rowhit/redo,pombredanne/redo,dinkelk/redo-python,dinkelk/redo-python,apenwarr/redo,apenwarr/redo,rowhit/redo,dinkelk/redo-python,apenwarr/redo,dinkelk/redo-python,pombredanne/redo,pombredanne/redo,rowhit/redo,rowhit/redo,pombredanne/redo