Unify SetupDaemon/SetupLogging

The 'old-style' info, error, debug logs do not make much sense. This
patch unifies the SetupLogging and SetupDaemon functions. As a result,
all the commands logs to a 'commands.log' file.

The patch also changes the log setup to keep going if there's an error
in setting up the file logging but we're logging to stderr.

Also, burnin now logs to its own file (burnin.log).

Reviewed-by: ultrotter