Description of problem:
When running the the upgrade_tasks and post_upgrade_tasks for ceph during FFU upgrade to RHOSP 16.1 will if ceph-mon-${HOSTNAME} does not match the containers name during system_upgrade on the bootstrap node. 

In a setup intergated with IdM this can be a FQDN, while the default and supported container name for ceph uses shortnames. 

How reproducible:
Everytime 


Steps to Reproduce:
1. Deploy RHOSP 13 Integrated with IdM using novajoin https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/integrate_with_identity_service/idm-novajoin

2. Follow the  Framework for Upgrades (13 to 16.1) documentation.


Actual results:

2020-10-23  04:31:40,455 p=5846 u=mistral n=ansible | failed: [controller-0 ->  192.168.24.33] (item=nobackfill) => {"ansible_loop_var": "item",  "changed": true, "cmd": "docker exec -u root ceph-mon-${HOSTNAME} ceph  osd set nobackfill", "delta":  "0:00:00.025770", "end": "2020-10-23 04:31:40.395243", "item":  "nobackfill", "msg": "non-zero return code", "rc": 1, "start":  "2020-10-23 04:31:40.369473", "stderr": "Error response from daemon: No  such container: ceph-mon-controller-0.redhat.local",  "stderr_lines": ["Error response from daemon: No such container:  ceph-mon-controller-0.redhat.local"], "stdout": "", "stdout_lines": []}
2020-10-23  04:31:40,658 p=5846 u=mistral n=ansible | failed: [controller-0 ->  192.168.24.33] (item=norebalance) => {"ansible_loop_var": "item",  "changed": true, "cmd": "docker exec -u root ceph-mon-${HOSTNAME} ceph osd set norebalance", "delta":  "0:00:00.028196", "end": "2020-10-23 04:31:40.612835", "item":  "norebalance", "msg": "non-zero return code", "rc": 1, "start":  "2020-10-23 04:31:40.584639", "stderr": "Error response from daemon: No  such container: ceph-mon-controller-0.redhat.local",  "stderr_lines": ["Error response from daemon: No such container:  ceph-mon-controller-0.redhat.local"], "stdout": "", "stdout_lines": []}
2020-10-23  04:31:40,860 p=5846 u=mistral n=ansible | failed: [controller-0 ->  192.168.24.33] (item=nodeep-scrub) => {"ansible_loop_var": "item",  "changed": true, "cmd": "docker exec -u root ceph-mon-${HOSTNAME} ceph  osd set nodeep-scrub", "delta":  "0:00:00.025621", "end": "2020-10-23 04:31:40.821615", "item":  "nodeep-scrub", "msg": "non-zero return code", "rc": 1, "start":  "2020-10-23 04:31:40.795994", "stderr": "Error response from daemon: No  such container: ceph-mon-controller-0.redhat.local",  "stderr_lines": ["Error response from daemon: No such container:  ceph-mon-controller-0.redhat.local"], "stdout": "", "stdout_lines": []}

[heat-admin@controller-2 ~]$ sudo podman ps |grep ceph
910bce71e597  registry.redhat.io/rhceph/rhceph-4-rhel8:4-33                                                     4 days ago   Up 4 days ago          ceph-rgw-controller-2-rgw0
5486c84877f9  registry.redhat.io/rhceph/rhceph-4-rhel8:4-33                                                     4 days ago   Up 4 days ago          ceph-mds-controller-2
5de932b1ef1e  registry.redhat.io/rhceph/rhceph-4-rhel8:4-33                                                     4 days ago   Up 4 days ago          ceph-mgr-controller-2
3030ca655de4  registry.redhat.io/rhceph/rhceph-4-rhel8:4-33                                                     4 days ago   Up 4 days ago          ceph-mon-controller-2


Expected results:

For the playbook to be able to find the container if it has either the host shortname or FQDN


Additional info:
Will affect any deployment where ${HOSTNAME} returns a FQDN  and does not have "ceph_use_fqdn: true"

https://github.com/openstack/tripleo-heat-templates/blob/stable/train/deployment/ceph-ansible/ceph-osd.yaml#L87
https://github.com/openstack/tripleo-heat-templates/blob/stable/train/deployment/ceph-ansible/ceph-osd.yaml#L114

Workaround the issue by getting the container name in a seperate task 

~~~
    601             - name: Get ceph-mon containers
    602               shell: "{{ container_cli }} ps -q -f name=ceph-mon"
    603               register: ceph_mon_result
    604             - name: Unset noout flag
    605               shell: "{{ container_cli }} exec -u root {{ ceph_mon_result.stdout }} ceph osd unset {{ item }}"
    606               become: true
    607               with_items:
    608                 - noout
    609                 - norecover
    610                 - nobackfill
    611                 - norebalance
    612                 - nodeep-scrub
    613               vars:
    614                 container_client: |-
    615                   {% set container_client = 'podman' %}
    616                   {%   if check_docker_cli.stat.exists|bool %}
    617                   {%     set container_client = 'docker' %}
    618                   {%   endif %}
    619                   {{ container_client }}
    620           delegate_to: "{{ ceph_mon_short_bootstrap_node_name }}"
    621           tags:
    622             - never
    623             - system_upgrade
    624             - system_upgrade_prepare
    625           when:
    626             - step|int == 1
    627             - upgrade_leapp_enabled
    628       post_upgrade_tasks:
    629         - name: Get ceph-mon containers
    630           shell: "{{ container_cli }} ps -q -f name=ceph-mon"
    631           register: ceph_mon_result
    632         - name: Unset noout flag
    633           shell: "{{ container_cli }} exec -u root {{ ceph_mon_result.stdout }} ceph osd unset {{ item }}"
    634           with_items:
    635             - noout
    636             - norecover
    637             - nobackfill
    638             - norebalance
    639             - nodeep-scrub
    640           when: step|int == 2
    641           become: true
  ~~~