There is no point of using hosts running on atomic AND centos hosts. So
let's run containerized scenarios on Atomic only.
This solves this error here:
```
fatal: [client2]: FAILED! => {
"failed": true
}
MSG:
The conditional check 'ceph_current_status.rc == 0' failed. The error was: error while evaluating conditional (ceph_current_status.rc == 0): 'dict object' has no attribute 'rc'
The error appears to have been in '/home/jenkins-build/build/workspace/ceph-ansible-nightly-luminous-stable-3.1-ooo_collocation/roles/ceph-defaults/tasks/facts.yml': line 74, column 3, but may
be elsewhere in the file depending on the exact syntax problem.
The offending line appears to be:
- name: set_fact ceph_current_status (convert to json)
^ here
```
From https://2.jenkins.ceph.com/view/ceph-ansible-stable3.1/job/ceph-ansible-nightly-luminous-stable-3.1-ooo_collocation/37/consoleFull#1765217701b5dd38fa-a56e-4233-a5ca-584604e56e3a
What's happening here is all the hosts excepts the clients are running atomic, so here: https://github.com/ceph/ceph-ansible/blob/master/site-docker.yml.sample#L62
The condition will skipped all the nodes excepts the clients, thus when running ceph-default, the task "is ceph running already?" is skipped but the task above needs the rc of the skipped task.
This is not an error from the playbook, it's a CI setup issue.
Signed-off-by: Sébastien Han <seb@redhat.com>