undercloud/mysql: remove useless task for upgrade

This task is only useful in Rocky, when upgrading an non containerized
undercloud from Queens to a containerized undercloud on Rocky.
Therefore, the parameter UndercloudUpgrade should not have been
backported in : I2399a72709d240f84e3463c5c3b56942462d1e5c

Closes-Bug: #1787010
Change-Id: I2b5690dfd3662837b28c9801a0f37e785547f813

docker/services/database/mysql.yaml

@@ -250,19 +250,6 @@ outputs:
               tags: validation
         - when: step|int == 2
           block:
-            # https://bugs.launchpad.net/tripleo/+bug/1753247
-            - name: Rename old neutron database to ovs_neutron
-              shell: >
-                if [ -d /var/lib/mysql/neutron ] ; then
-                  mysql -e "CREATE DATABASE IF NOT EXISTS \`ovs_neutron\`;"
-                  for table in `mysql -B -N -e "SHOW TABLES;" neutron`
-                    do
-                      mysql -e "RENAME TABLE \`neutron\`.\`$table\` to \`ovs_neutron\`.\`$table\`"
-                    done
-                  mysql -e "DROP DATABASE \`neutron\`;"
-                fi
-              become: true
-              when: {get_param: UndercloudUpgrade}
             - name: Stop and disable mysql service
               when: mariadb_enabled|bool
               service: name=mariadb state=stopped enabled=no