Enable PowerTools repository for distro installs

RDO repo relies on some libraties that are present in PowerTools
repository. This repo exists in base image, however is disabled.
From the other side, zuul adds this repo with base jobs and enable it
in CI by default.
So not to deal with getting right URL and etc, we're just running command

Change-Id: I028dce38a4b7dbdd3683b4ad07bd2f5cd19ed1b5

tasks/openstack_hosts_configure_dnf.yml

@@ -101,3 +101,11 @@
   when:
     - ansible_os_family | lower == 'redhat'
     - ansible_distribution_major_version is version('8', '=')
+
+- name: Enable PowerTools repository
+  command: yum-config-manager --enable PowerTools
+  changed_when: false
+  when:
+    - ansible_os_family | lower == 'redhat'
+    - ansible_distribution_major_version is version('8', '=')
+    - install_method == 'distro'

tests/group_vars/all.yml

@@ -15,3 +15,5 @@
 
 global_environment_variables:
   PATH: "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
+
+install_method: source