Merge pull request #627 from rjeffman/roles_fix_distros

Use Ansible fact "os_family" as fallback, when distro is not directly suppported.

roles/ipaserver/vars/CentOS-8.yml

-RedHat-8.yml
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roles/ipaserver/vars/OracleLinux-7.yml

-RedHat-7.yml
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roles/ipaserver/vars/OracleLinux-8.yml

-RedHat-8.yml
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roles/ipaserver/vars/RedHat-7.3.yml

-# defaults file for ipaserver
-# vars/rhel.yml
-ipaserver_packages: [ "ipa-server", "libselinux-python" ]
-ipaserver_packages_dns: [ "ipa-server-dns" ]
-ipaserver_packages_adtrust: [ "ipa-server-trust-ad" ]
-ipaserver_packages_firewalld: [ "firewalld" ]
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