Description of problem:

Following this documentation:
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.2/html/backing_up_and_restoring_the_undercloud_and_control_plane_nodes/assembly_backing-up-the-control-plane-nodes_br-undercloud-ctlplane

When running:
(undercloud) [stack@rhosp-inst ~]$ openstack overcloud backup --inventory /home/stack/tripleo-inventory.yaml


With 16.2:
~~~
TASK [backup-and-restore : Set the tripleo_backup_and_restore_mysql_container id] ***
ok: [rhosp16-1-ctl-0] => {"ansible_facts": {"tripleo_backup_and_restore_mysql_container": "xxxxxxxxxxxx"}, "changed": false}
ok: [rhosp16-1-ctl-1] => {"ansible_facts": {"tripleo_backup_and_restore_mysql_container": "xxxxxxxxxxxx"}, "changed": false}
ok: [rhosp16-1-ctl-2] => {"ansible_facts": {"tripleo_backup_and_restore_mysql_container": "xxxxxxxxxxxx"}, "changed": false}

TASK [backup-and-restore : Unpause mysql for backup if it is paused] ***********
skipping: [rhosp16-1-ctl-0] => {"changed": false, "skip_reason": "Conditional result was False"}
skipping: [rhosp16-1-ctl-1] => {"changed": false, "skip_reason": "Conditional result was False"}
skipping: [rhosp16-1-ctl-2] => {"changed": false, "skip_reason": "Conditional result was False"}

TASK [backup-and-restore : MySQL Grants backup] ********************************
changed: [rhosp16-1-ctl-0] => {"censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result", "changed": true}
changed: [rhosp16-1-ctl-1] => {"censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result", "changed": true}
changed: [rhosp16-1-ctl-2] => {"censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result", "changed": true}
~~~

With 16.2.1:
~~~
TASK [backup-and-restore : Set the tripleo_backup_and_restore_mysql_container id] ********************************************************************************************************************************
ok: [rhosp16-1-ctl-0] => {"ansible_facts": {"tripleo_backup_and_restore_mysql_container": "xxxxxxxxxxxx"}, "changed": false}
ok: [rhosp16-1-ctl-1] => {"ansible_facts": {"tripleo_backup_and_restore_mysql_container": "xxxxxxxxxxxx"}, "changed": false}
ok: [rhosp16-1-ctl-2] => {"ansible_facts": {"tripleo_backup_and_restore_mysql_container": "xxxxxxxxxxxx"}, "changed": false}

TASK [backup-and-restore : Unpause mysql for backup if it is paused] *********************************************************************************************************************************************
skipping: [rhosp16-1-ctl-0] => {"changed": false, "skip_reason": "Conditional result was False"}
skipping: [rhosp16-1-ctl-1] => {"changed": false, "skip_reason": "Conditional result was False"}
skipping: [rhosp16-1-ctl-2] => {"changed": false, "skip_reason": "Conditional result was False"}

TASK [backup-and-restore : Galera desync the MySQL node] *********************************************************************************************************************************************************
fatal: [rhosp16-1-ctl-0]: FAILED! => {"censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result"}
fatal: [rhosp16-1-ctl-1]: FAILED! => {"censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result"}
fatal: [rhosp16-1-ctl-2]: FAILED! => {"censored": "the output has been hidden due to the fact that 'no_log: true' was specified for this result"}
~~~

Version-Release number of selected component (if applicable):
OpenStack 16.2.1

How reproducible:
Every time.

Steps to Reproduce:
1.
2.
3.

Actual results:
Overcloud backup failing.

Expected results:
Being able to run `openstack overcloud backup --inventory /home/stack/tripleo-inventory.yaml` with 16.2.1

Additional info:
~~~
  * Container bundle set: galera-bundle [cluster.common.tag/openstack-mariadb:pcmklatest]:
    * galera-bundle-0   (ocf::heartbeat:galera):         Master rhosp16-1-ctl-1
    * galera-bundle-1   (ocf::heartbeat:galera):         Master rhosp16-1-ctl-0
    * galera-bundle-2   (ocf::heartbeat:galera):         Master rhosp16-1-ctl-2
~~~