Set gunicorn package name on RedHat family

[kronos-pbrideau]

On centos6, package name from epel is python-gunicorn

Name        : python-gunicorn
Arch        : noarch
Version     : 18.0
Release     : 1.el6
Size        : 175 k
Repo        : epel
Summary     : Python WSGI application server
URL         : http://gunicorn.org/
License     : MIT
Description : Gunicorn ("Green Unicorn") is a Python WSGI HTTP server for UNIX. It uses the
            : pre-fork worker model, ported from Ruby's Unicorn project. It supports WSGI,
            : Django, and Paster applications.

On centos 7, package name from extra is also python-gunicorn

Name        : python-gunicorn
Arch        : noarch
Version     : 18.0
Release     : 2.el7
Size        : 171 k
Repo        : extras/7/x86_64
Summary     : Python WSGI application server
URL         : http://gunicorn.org/
License     : MIT
Description : Gunicorn ("Green Unicorn") is a Python WSGI HTTP server for UNIX. It uses the
            : pre-fork worker model, ported from Ruby's Unicorn project. It supports WSGI,
            : Django, and Paster applications.

I have not found a gunicorn package in epel for centos5 on https://dl.fedoraproject.org/pub/epel/5