Assert distribution support

[ekohl]

This takes the approach that if a distribution is supported, it should support certain versions that Foreman supports.

Currently this fails because not all modules mark the distributions as supported. This is an effort to ensure a platform is supported when we add it. Below is a list of current failures:

• Puppet module puppetdb should support Debian 10 - module removed
• Puppet module augeasproviders_core should support CentOS 7 / Debian 10 - Add Debian 10 and Red Hat 8 to the supported OS list voxpupuli/puppet-augeasproviders_core#21
• Puppet module augeasproviders_sysctl should support Debian 10 - Add Debian 10 and Red Hat, CentOS & OL 8 voxpupuli/puppet-augeasproviders_sysctl#39
• Puppet module extlib should support Debian 10 - Mark Red Hat 8, CentOS 8 and Debian 10 as supported voxpupuli/puppet-extlib#154
• Puppet module foreman_proxy should support CentOS 8 - Fixes #29213 - Support el8 puppet-foreman_proxy#582
• Puppet module inifile should support Debian 10 - can't use 4.x due to puppetdb
• Puppet module mongodb should support CentOS 8 / Debian 10 - WONTFIX, irrelevant
• Puppet module pulp should support CentOS 8 - WONTFIX, irrelevant
• Puppet module puppet should support CentOS 8 - Fixes #29735 - support el8 puppet-puppet#742
• Puppet module qpid should support CentOS 8 - WONTFIX, irrelevant
• Puppet module redis should support Debian 10 - Debian10 fix voxpupuli/puppet-redis#338
• Puppet module squid should support CentOS 8 / Debian 10 / Ubuntu 18.04 - in git master but irrelevant
• Puppet module translate should support CentOS 7 / Ubuntu 18.04 - Add CentOS 5-7 and Ubuntu 18.04 puppetlabs-toy-chest/puppetlabs-translate#70
• Puppet module trusted_ca should support Debian 10 - Add Debian 10 support voxpupuli/puppet-trusted_ca#21

[theforeman-bot]

@ekohl, this pull request is currently not mergeable. Please rebase against the develop branch and push again.

If you have a remote called 'upstream' that points to this repository, you can do this by running:

    $ git pull --rebase upstream develop

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This message was auto-generated by Foreman's prprocessor

[theforeman-bot]

@ekohl, this pull request is currently not mergeable. Please rebase against the develop branch and push again.

If you have a remote called 'upstream' that points to this repository, you can do this by running:

    $ git pull --rebase upstream develop

---

This message was auto-generated by Foreman's prprocessor

[ekohl]

Updated to include EL8 to verify https://projects.theforeman.org/issues/29189. It will still fail and #493 is probably needed since that module isn't really receiving any attention. MongoDB on Debian 10 is not relevant to us, so I might special case it.