Use mariadb-server image for mariabackup

The mariadb image is deprecated in Victoria and will be removed in
Wallaby. Use the mariadb-server image instead.

NOTE(priteau): Release note changed from `fixes` to `other` and wording
updated for Victoria.

Change-Id: I90986e7521779997df2782767bb95efcbd8ef232
(cherry picked from commit bb56861)

Author: priteau

ansible/roles/mariadb/defaults/main.yml

@@ -104,7 +104,7 @@ mariadb_wsrep_extra_provider_options: []
 ####################
 # Backups
 ####################
-mariabackup_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ mariadb_install_type }}-mariadb"
+mariabackup_image: "{{ docker_registry ~ '/' if docker_registry else '' }}{{ docker_namespace }}/{{ kolla_base_distro }}-{{ mariadb_install_type }}-mariadb-server"
 mariabackup_tag: "{{ openstack_tag }}"
 mariabackup_image_full: "{{ mariabackup_image }}:{{ mariabackup_tag }}"
 

releasenotes/notes/mariabackup-image-8b31622f59890e28.yaml

@@ -0,0 +1,7 @@
+---
+other:
+  - |
+    Updates the container image used by mariabackup. It was using the
+    ``mariadb`` image, which was deprecated in Victoria and will be removed in
+    Wallaby. The ``mariadb-server`` image is used instead. `LP#1928129
+    <https://launchpad.net/bugs/1928129>`__