This adds "69" to the return codes from the status command that should be
considered as not running. At least "django-celery" uses this return code,
maybe others::
/venv/bin/python /code/project/manage.py celeryctl status
echo $? # 69 when not running.
A bit of googling let me to http://tldp.org/LDP/abs/html/exitcodes.html and
on a Ubuntu Server 12.10 I get::
~# cat /usr/include/sysexits.h | grep 69
#define EX_UNAVAILABLE 69 /* service unavailable */
I'm not sure if the content of sysexits.h is the same on other OS'es.
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