workers.conf+worker.conf example in 6.14.2 could be simplified

[Chris Pick]

I was looking at the workers.conf+worker.conf example at the end of http://upstart.ubuntu.com/cookbook/#another-instance-example and workers.conf's post-stop script looked a little brittle, particularly the parsing in:
for inst in `initctl list|grep "^worker "|awk '{print $2}'|tr -d ')'|tr -d '('`

Would it be simpler to remove the workers.conf's post-stop script altogether and instead add a 'stop on stopping workers' line to worker.conf?

I'll add my suggestion as a patch to this ticket to see if it makes sense for inclusion.