Add CentOS8 High Availability repository

High Availability packages have been added as part of core CentOS
repositories in 8.1.

This patch add this repo and enables it as it provides corosync and
pacemaker based HA solution and some other packages required for it.

Change-Id: Idbddd81f251c1ade97892128e52f9214420bead7

roles/configure-mirrors/tasks/mirror/CentOS-8.yaml

@@ -9,6 +9,7 @@
   with_items:
     - etc/yum.repos.d/CentOS-AppStream.repo
     - etc/yum.repos.d/CentOS-Base.repo
+    - etc/yum.repos.d/CentOS-HA.repo
     - etc/yum.repos.d/CentOS-Extras.repo
     - etc/yum.repos.d/CentOS-PowerTools.repo
     - etc/yum.repos.d/epel.repo

roles/configure-mirrors/templates/centos8/etc/yum.repos.d/CentOS-HA.repo.j2

@@ -0,0 +1,7 @@
+# {{ ansible_managed }}
+[HighAvailability]
+name=CentOS-$releasever - HA
+baseurl={{ package_mirror }}/$releasever/HighAvailability/$basearch/os/
+gpgcheck=1
+enabled=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial