docs: def floating_ip_disassociate(self, server_name, floating_ip):
          '''
          Disassociate a floating IP from server
  
          .. versionadded:: 2016.3.0
          '''
          nt_ks = self.compute_conn
          server_ = self.server_by_name(server_name)
          server = nt_ks.servers.get(server_.__dict__['id'])
          server.remove_floating_ip(floating_ip)
          return self.floating_ip_list()[floating_ip]