Added --cmd-suffix argument to the celeryd-multi tool.
Added --cmd-suffix argument to the celeryd-multi tool.

This enables the use of the %n and %h template variables in a command suffix,
like in the following example:

celeryd-multi start 10 -c 1 --cmd="nohup python manage.py celeryd" \
                            --cmd-suffix="> logs/worker%n.txt 2>&1 &"

Effectively sending each worker's output to a separate log file. (Instead of
using the -f parameter.)

cbrepo/celery,WoLpH/celery,frac/celery,frac/celery,WoLpH/celery,mitsuhiko/celery,cbrepo/celery,ask/celery,mitsuhiko/celery,ask/celery