Add RHEL 8, CentOS 8, and Fedora 30 to the supported OS list.

Update supported OS list in module metadata

modulesync 2.8.0

Updated selinux types to avoid runtime errors when SELinux is disabled.
selinux::boolean, selinux::fcontext, and selinux::port will now essentially
do nothing when SELinux is disabled.

This uses the platform python if it exists, which requires
no additional dependencies

Fix selinux_port on RHEL 8/CentOS 8

https://voxpupuli.org/<module> is deprecated since puppet strings
produces mardown we can ship

fix reference documentation link

Changed double quotes to single quotes in example in comments

Regenerate REFERENCE.md

Clean up acceptance spec helper

Provide data for all OSes that follow RedHat's versionning: people might
be using this module on variants not officially supported.

- Change BEAKER_set to BEAKER_setfile and layouts that are accepted by
  present-day beaker-hostgenerator.
- Set BEAKER_PUPPET_COLLECTION, otherwise one gets PC1.
- Update the Fedora versions to match metadata.json, and work around
  beaker-hostgenerator and archived Vagrant boxes issues.
- Provide a separate script for ease of use.

- Add support for installation, mode switching, and module compilation
  on Debian 10.
- Skip the tests that exercise the Ruby types on this platform (see
  README).
- Extend the main class' interface to manage more than a single package
  for SELinux.
- Manage the auditd package on Debian as per the docs (can be disabled).

add partial support for Debian 10, and supporting changes

update example to match current version

Avoid puppet errors when SELinux is disabled

Release of 3.1.0