Fedora-EPEL: no package for python-celery

[hairmare]

There is one in PUIAS Unsupported and @radiorabe has its own build of it for the time being. It used to be in EPEL-6 ages ago.

• https://pkgs.org/download/python-celery
• https://apps.fedoraproject.org/packages/python-celery
• https://build.opensuse.org/package/show/home:radiorabe:airtime:celery/python-celery