Rework how we setup logging for Crowbar [3/3]

There are two main changes:

instead of putting stdout/stderr in production.log, we put them in
production.stdout and production.stderr.

we really use production.log to log things, instead of using syslog
which loses the formatting and spams /var/log/messages.

The rationale for using syslog was "distributed setups", but since we
put the logs of chef-client runs in /opt/dell/crowbar_framework anyway,
I don't think this rationale stands.