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
6c33feb305