Upstart incorrectly described as logging to syslog

[Matthew Phipps]

The section on log-priority (http://upstart.ubuntu.com/cookbook/#id239) claims that Upstart logs to syslog, but 1.5 logs to the kernel ring buffer instead. Normally messages to the kernel ring buffer get logged to /var/log/syslog and kern.log, but rsyslogd filters out such messages by default if they came from a user space process (like Upstart). You can see the messages in dmesg though, and you can configure rsyslogd to process them if you add `$KLogPermitNonKernelFacility on` to rsyslogd's config.

More details here: http://askubuntu.com/a/490900/297973