cleanup: stop setting priority in a follow-up task

We can set priority directly inside the yum_repository module
therefore there's no need for us to actually set it in a follow-up
task that's not idempotent.

Change-Id: Ie5ae5c051055ed532b3ae9dd64c2cb3d15c7173a

tasks/galera_client_install_yum.yml

@@ -62,6 +62,7 @@
     name: "{{ item.name }}"
     description: "{{ item.description }}"
     baseurl: "{{ item.baseurl }}"
+    priority: 25
     gpgkey: "{{ item.gpgkey | default(omit) }}"
     gpgcheck: yes
     enabled: yes
@@ -73,13 +74,3 @@
     - "{{ galera_client_repo }}"
   tags:
     - galera-repos
-
-# NOTE(hwoarang): MariaDB repository is prioritized at 99 by default
-# and that allows yum to install mariadb client from the RDO repos, which
-# is not good. This task ensures that the following tasks will choose
-# MariaDB repo as the highest priority.
-- name: Ensure MariaDB repository takes highest priority
-  command: |
-      yum-config-manager
-        --enable MariaDB
-        --setopt="MariaDB.priority=25"