OpenStack Minor update fails while removing old container images.

Issue

During the Overcloud update, the following failure is observed:

TASK [Get a list of container using Mariadb image] *****************************
Tuesday 15 October 2019  00:24:09 +1100 (0:00:00.626)       0:03:54.846 ********
changed: [controller-0] => {"changed": true, "cmd": "docker ps -a -q -f 'ancestor=ab31788f18db\n6f481454f0e5'", "delta": "0:00:0
0.057514", "end": "2019-10-15 00:24:10.243508", "rc": 0, "start": "2019-10-15 00:24:10.185994", "stderr": "", "stderr_line
s": [], "stdout": "", "stdout_lines": []}

TASK [Remove any container using the same Mariadb image] ***********************
Tuesday 15 October 2019  00:24:10 +1100 (0:00:00.578)       0:03:55.424 ********

TASK [Remove previous Mariadb images] ******************************************
Tuesday 15 October 2019  00:24:10 +1100 (0:00:00.082)       0:03:55.507 ********
fatal: [controller-0]: FAILED! => {"changed": true, "cmd": "docker rmi -f ab31788f18db\n6f481454f0e5", "delta": "0:00:00.057039"
, "end": "2019-10-15 00:24:10.902", "msg": "non-zero return code", "rc": 127, "start": "2019-10-15 00:24:10.845", "s
tderr": "Error response from daemon: conflict: unable to delete ab31788f18db (cannot be forced) - image is being used by r
unning container ab31788f18db\n/bin/sh: line 1:6f481454f0e5: command not found", "stderr_lines": ["Error response from da
emon: conflict: unable to delete ab31788f18db (cannot be forced) - image is being used by running container ab31788f18db",
 "/bin/sh: line 1: 6f481454f0e5: command not found"], "stdout": "", "stdout_lines": []}


PLAY RECAP *********************************************************************
controller-0                     : ok=49   changed=19   unreachable=0    failed=1
controller-1                     : ok=2    changed=0    unreachable=0    failed=0
controller-2                     : ok=2    changed=0    unreachable=0    failed=0