Description of problem:
The upgrade_tasks_step1.yaml playbook is executed during the Host System upgrade (from RHEL 8.4 to 9.2) and It fails on the first task called "Set noout flag":
       - - name: Set noout flag
            shell: "cephadm shell -- ceph osd set {{ item }}"
            become: true
            with_items:
              - noout
              - norecover
              - nobackfill
              - norebalance
              - nodeep-scrub
            delegate_to: "{{ ceph_mon_short_bootstrap_node_name }}"
https://opendev.org/openstack/tripleo-heat-templates/src/branch/stable/wallaby/deployment/cephadm/ceph-osd.yaml#L109

Because the task is delegated to "ceph_mon_short_bootstrap_node_name" which points to one of the controllers which is not included in used inventory for DCN stack and I assume It would set the flags on the central ceph cluster anyway which is pointless when the DCN site has a different ceph cluster. 
Moreover I assume the command cephadm shell -- ceph osd set {{ item }} would fail anyway because It would not find the ceph cluster credentials. 

So there are two problems need to be fixed:
1. select the right ceph_mon node in the delegation
2. select the right cluster assuming we solve step 1
   The command cephadm shell -- ceph osd set {{ item }} should be able to find the right ceph cluster and look like something like:
cephadm  --fsid {{ tripleo_cephadm_fsid }} -c /etc/ceph/{{ tripleo_cephadm_cluster }}.conf -k /etc/ceph/{{ tripleo_cephadm_cluster }}.client.{{ select_keyring| default('admin') }}.keyring shell -- ceph osd set <flag>

Version-Release number of selected component (if applicable):
openstack-tripleo-common-containers-15.4.1-17.1.20230927010819.el9ost.noarch
puppet-tripleo-14.2.3-17.1.20231102190827.40278e1.el9ost.noarch
ansible-tripleo-ipsec-11.0.1-17.1.20230620172008.b5559c8.el9ost.noarch
ansible-tripleo-ipa-0.3.1-17.1.20230627190951.8d29d9e.el9ost.noarch
ansible-role-tripleo-modify-image-1.5.1-17.1.20230621064242.b6eedb6.el9ost.noarch
python3-tripleo-common-15.4.1-17.1.20230927010819.el9ost.noarch
openstack-tripleo-common-15.4.1-17.1.20230927010819.el9ost.noarch
tripleo-ansible-3.3.1-17.1.20231101230823.4d015bf.el9ost.noarch
openstack-tripleo-heat-templates-14.3.1-17.1.20231103010823.el9ost.noarch
openstack-tripleo-validations-14.3.2-17.1.20231026020815.2b526f8.el9ost.noarch
python3-tripleoclient-16.5.1-17.1.20230927000827.f3599d0.el9ost.noarch
openstack-tripleo-image-elements-13.1.3-17.1.20230621111410.a641940.el9ost.noarch
openstack-tripleo-puppet-elements-14.1.3-17.1.20230810141019.b4e0cbd.el9ost.noarch

How reproducible:
Always

Steps to Reproduce:
1. Execute the Host system upgrade of HCI compute nodes of DCN env during the FFU procedure.