func (ms *MockServers) Stop() {
	for idx := range ms.Servers {
		ms.StopAt(idx)
	}
	ms.wg.Wait()
}
func (ms *MockServers) Stop() {
	for idx := range ms.Servers {
		ms.StopAt(idx)
	}
	ms.wg.Wait()
}
// Stop stops the mock server, immediately closing all open connections and listeners.