chore(marketplace): remove gunicorn references

Conflicts:
	modules/marketplace/templates/nginx/marketplace.conf

Conflicts:
	modules/marketplace/templates/apps/zamboni/deploysettings.py
marketplace/olympia: add rabbitmq/celery workers.
marketplace/olympia: no olympia packages yet.
marketplace/olympia: add symlinks to webroot.
marketplace/olympia: pass netapp_storage_root to symlinks.
marketplace/olympia: change celery name from olympia to addons_olympia to match everything else.
marketplace/olympia: update celery_service_prefix.
marketplace/olympia: update celery user permissions.
marketplace/zamboni/deploysettings: set celery_service_prefix to undef as default.
marketplace/zamboni/deploysettings: set celery_service_prefix to false as default.
marketplace/fireplace/admin: define dreadnot stack.
marketplace/fireplace/admin: add dreadnot_instance.