Disable cephadm when ceph is deployed

After ceph is deployed, which means day1 operations are over
and the Ceph cluster daemons are up && running, cephadm can
be paused by running the 'disable_cephadm' playbook.
This can be triggered at step3 (to ensure all the daemons are
started) and can be triggered by the DisableCephadm exposed
parameter.

Closes-Bug: 1940866
Depends-On: I5952bb8a7a327e37a39acc95751cd5746fd9a41d
Change-Id: Idbafdaced85c945d38940be83c1a269c73e4cb6b

ci/environments/scenario001-standalone.yaml

@@ -189,6 +189,7 @@ parameter_defaults:
   CephMsgrSecureMode: true
   CephAnsibleSkipClient: false
   CephConfigPath: "/etc/ceph"
+  DisableCephadm: true
   LVMFilterEnabled: true
   LVMFilterAllowlist:
     - /dev/loop2

ci/environments/scenario004-standalone.yaml

@@ -76,6 +76,7 @@ parameter_defaults:
   # Workaround for https://bugs.launchpad.net/tripleo/+bug/1911022
   ExtraConfig:
     ganesha_vip: 192.168.24.3
+  DisableCephadm: true
   CephClusterName: ceph0
   CephConfigPath: "/etc/ceph"
   CephClientConfigVars: "{{ playbook_dir }}/cephadm/ceph_client.yml"

deployment/cephadm/ceph-base.yaml

@@ -375,6 +375,10 @@ parameters:
       with haproxy, etc), then this parameter should be set to true. Set this
       parameter to false to have cephadm deploy the ceph cluster during overcloud
       deployment. DeployedCeph and CephDynamicSpec are mutually exclusive.
+  DisableCephadm:
+    default: false
+    type: boolean
+    description: Disable cephadm after Ceph is deployed
 
 parameter_groups:
 - label: deprecated
@@ -621,6 +625,17 @@ outputs:
                 name: tripleo_run_cephadm
               when: groups['ceph_mon'] | default([]) | length > 0 or
                     groups['ceph_nfs'] | default([]) | length > 0
+        - name: ceph_base_external_deploy_task
+          when:
+            - (step | int) == 3
+            - {get_param: DisableCephadm}
+          tags:
+            - ceph
+          block:
+            - name: Pause cephadm
+              include_role:
+                name: tripleo_run_cephadm
+                tasks_from: disable_cephadm.yml
       post_upgrade_tasks:
         - name: Clean puppet-ceph package
           when: