fix handler name

roles/ceph-rbd/handlers/main.yml

 ---
 
-- name: enable rbdmap service
+- name: restart rbdmap
   systemd:
     name: rbdmap
     state: restarted

roles/ceph-rbd/tasks/main.yml

@@ -49,4 +49,6 @@
     enabled: true
     state: started
 
+- meta: flush_handlers
+
 ...