Fix deploy/genconfig in check mode

Previously, when running one of the following commands:

  kolla-ansible deploy --check
  kolla-ansible genconfig --check

deployment or configuration generation fails for various reasons.

MariaDB fails to lookup the existing cluster.

Keystone fails to generate cron config.

Nova-cell fails to get the cell settings.

Closes-Bug: #2002661
Change-Id: I5e765f498ae86d213d0a4379ca5d473db1499962

ansible/roles/keystone/tasks/config.yml

@@ -199,6 +199,7 @@
     -i {{ groups['keystone'].index(inventory_hostname) }}
     -n {{ (groups['keystone'] | length) }}
   changed_when: false
+  check_mode: false
   register: cron_jobs_json
   delegate_to: localhost
 

ansible/roles/mariadb/tasks/lookup_cluster.yml

@@ -50,6 +50,7 @@
             --silent --skip-column-names
             -e 'SHOW STATUS LIKE "wsrep_local_state_comment"'
           changed_when: false
+          check_mode: false
           register: check_mariadb_sync_status
           no_log: true
 

ansible/roles/nova-cell/tasks/get_cell_settings.yml

@@ -18,6 +18,7 @@
   changed_when: false
   failed_when:
     - existing_cells_list.rc != 0
+  check_mode: false
 
 - name: Extract current cell settings from list
   vars:

ansible/roles/nova-cell/tasks/wait_discover_computes.yml

@@ -22,6 +22,7 @@
       register: nova_compute_services
       changed_when: false
       failed_when: false
+      check_mode: false
       retries: 20
       delay: 10
       until:

releasenotes/notes/fix-check-mode-1f37ab5507c98954.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixes deployment when using Ansible check mode. `LP#2002661
+    <https://bugs.launchpad.net/kolla-ansible/+bug/2002661>`__