[ATMOSPHERE-418] generate_workspace: Set mgr/cephadm/warn_on_stray_daemons to false (#1829)

This is an automated cherry-pick of #1241
/assign mnaser
diff --git a/roles/rook_ceph_cluster/tasks/main.yml b/roles/rook_ceph_cluster/tasks/main.yml
index 078bd38..39675d7 100644
--- a/roles/rook_ceph_cluster/tasks/main.yml
+++ b/roles/rook_ceph_cluster/tasks/main.yml
@@ -14,10 +14,10 @@
 
 # (rlin) This is because rgw will be managed by rook operator. We need to mute
 # CEPHADM_STRAY_DAEMON until we have all daemon managed by cephadm
-- name: Mute CEPHADM_STRAY_DAEMON warning
+- name: Set mgr/cephadm/warn_on_stray_daemons to false
   run_once: true
   delegate_to: "{{ groups[rook_ceph_cluster_mon_group][0] }}"
-  ansible.builtin.command: cephadm shell -- ceph health mute CEPHADM_STRAY_DAEMON
+  ansible.builtin.command: cephadm shell -- ceph config set mgr mgr/cephadm/warn_on_stray_daemons false
   failed_when: false
   changed_when: false