code: def ceph_is_installed(module):
      
      ceph_package = Ceph(module.conn)
      if not ceph_package.installed:
          host = module.conn.hostname
          raise RuntimeError(
              'ceph needs to be installed in remote host: %s' % host
          )
docs: A helper callback to be executed after the connection is made to ensure
      that Ceph is installed.