Add CephAnsibleRepo warning to make this validation more flexible

Under specific scenarios (FFU) we have ceph-ansible installed but
no repo is available on the system due to the leapp process.
This patch expose an existing parameter (always hard-coded to true)
to let the validation print the warning but avoiding the whole
playbook failing on the CephAnsibleRepo task.

Change-Id: I7083e4dc8b4d14f33837ffe7cc6299ea1ac4b70f
(cherry picked from commit 6c33feb305)

deployment/ceph-ansible/ceph-base.yaml

@@ -302,6 +302,13 @@ parameters:
       package. This value can be used by tripleo-validations to double check
       the right ceph-ansible version is installed.
     default: 'centos-ceph-nautilus'
+  CephAnsibleWarning:
+    type: boolean
+    description: |
+      In particular scenarios we want this validation to show the warning but
+      don't fail because the package is installed on the system but repos are
+      disabled.
+    default: true
   CinderEnableRbdBackend:
     default: false
     description: Whether to enable or not the Rbd backend for Cinder
@@ -631,7 +638,7 @@ outputs:
                 role: ceph
                 tasks_from: ceph-ansible-installed
               vars:
-                fail_without_ceph_ansible: true
+                fail_without_ceph_ansible: {get_param: CephAnsibleWarning}
                 ceph_ansible_repo: {get_param: CephAnsibleRepo}
               tags:
                 - opendev-validation