Use remote_syslog to pipe openstack logs to a syslog server.

Rather than dumping all openstack service logs into syslog,
and aggregating them that way, use the remote_syslog service
to watch the log-files in place, and send them directly to a
remote syslog server, bypassing local syslog.

The motivations for this are:
  - preserve service-specific log files to make it easy to zero in
    on specific log entries on a single box.
  - Avoid pumping tons of logs into local syslog and cluttering it up.