Add MariaDB infrastructure mirrors

Change-Id: I49a744ee5c41279f4a17bc7d2339d12c3a132026

common-tasks/test-set-nodepool-vars.yml

@@ -33,6 +33,7 @@
         echo "centos_epel_mirror=${NODEPOOL_EPEL_MIRROR}"
         echo "galera_percona_xtrabackup_repo_host=${NODEPOOL_PERCONA_PROXY}"
         echo "openstack_hosts_rdo_mirror_url=${NODEPOOL_RDO_PROXY}"
+        echo "galera_repo_host=${NODEPOOL_MIRROR_HOST}:8080"
         if [[ ${NODEPOOL_PYPI_MIRROR} == *.ovh.* ]]; then
           echo "nova_virt_type=qemu"
         fi