Remove bootstrap_mariadb with cleanup-containers

TrivialFix

Change-Id: Ic6884d46d8edf2d430f8a9fb8635f7d98d011112

tools/cleanup-containers

@@ -11,7 +11,7 @@ if [ -n "$1" ]; then
     volumes_to_remove=($(docker volume ls | grep -E "$1" | awk '{print $1}'))
 else
     containers_to_kill=(
-        bootstrap_{ceph_mon,cinder,glance,heat,heka,ironic,ironic_pxe,keystone,magnum,mistral,mongodb,murano,neutron,nova,nova_compute} \
+        bootstrap_{ceph_mon,cinder,glance,heat,heka,ironic,ironic_pxe,keystone,magnum,mariadb,mistral,mongodb,murano,neutron,nova,nova_compute} \
         cinder_{volume,scheduler,backup,api} \
         ceph_{mon,rgw} \
         cron \