Revert "Update metadata to support el8 instead of el7"
Revert "Update metadata to support el8 instead of el7"

This reverts commit ff22e7c2687bc8f67d6769c32b235257ac0f8e5f.

Change-Id: Idc654bd3fc42b4005527cdf833ed24e9e2bf2963
Closes-Bug: #1872562

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo