Revert "CLOUDIFY-1826 run celery with sudo when running on linux"

This reverts commit 556aee2da4715e299dcc72c9f698f9aff48d3133.
Merge branch 'feature/CLOUDIFY-1826-celery-tasks' of https://github.com/CloudifySource/cosmo-messaging into feature/CLOUDIFY-1826-celery-tasks