Add support for Fedora / RedHat / Centos
*Created by: nemesisdesign* Fedora is a popular linux distribution that is suitable to be used for hosting an openwisp2 instance. The parts to change to add support to Fedora are the following ones: - management of system packages: use yum module instead of apt and the names of some packages are different - nginx configuration, path differ slightly - supervisord configuration, a few things differ here too
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