Use a named pipe for logging in upstart example

The ability to log directly to /dev/kmsg was removed in Ubuntu 14.04,
making the existing example config fail to perform any real logging.
Appending a pipe to the last `exec` within the `script` block gives
upstart an incorrect PID to work with, which can lead to various issues.

This uses a FIFO solution that logs to syslog at any permission level
and doesn't leave anything on the file system afterwards.
Remove fifo logger examples from upstart conf

Simply notes the default log location and synchronizes the one and many
example configs.
Merge pull request #2046 from sorentwo/upstart-logging

Use a named pipe for logging in upstart example