Fix #772 only check celery in dev channel
Fix #772 only check celery in dev channel

On production, we may have to start servers in different order. The
checks on Rabbit and Celery inhibit that. It's better to let the
configuration management system enforce services.

mkeilman/sirepo,mrakitin/sirepo,mrakitin/sirepo,mrakitin/sirepo,mkeilman/sirepo,radiasoft/sirepo,mkeilman/sirepo,radiasoft/sirepo,radiasoft/sirepo,radiasoft/sirepo,mrakitin/sirepo,mkeilman/sirepo,radiasoft/sirepo