Restore title of supervisor process service

Refactores supervisorctl arguments: it will always use some-prog:* even
if `numprocs` is 1. This works. See
https://github.com/Supervisor/supervisor/blob/master/supervisor/options.py#L1990
Fix the mocked supervisorctl output

We noticed that the mocked output does not match the real supervisorctl
output. This could use some kind of integration testing, maybe with
serverspec.