clone函数切片应该使用深拷贝

```ruby
func (h *HeartbeatChecker) Clone() ziface.IHeartbeatChecker {

heartbeat := &HeartbeatChecker{
interval: h.interval,
quitChan: make(chan bool),
beatFunc: h.beatFunc,
makeMsg: h.makeMsg,
onRemoteNotAlive: h.onRemoteNotAlive,
msgID: h.msgID,
router: h.router,
routerSlices: h.routerSlices,
conn: nil, // The bound connection needs to be reassigned
}

return heartbeat
}
```

其中routerSlices是一个切片，他应该使用深拷贝，否则修改原始hb会修改新的hb，例如

```ruby
func HeatBeatDefaultHandle111(req ziface.IRequest) {
zlog.Ins().InfoF("Recv Heartbeat from %s, MsgID = %+v, Data = %s",
req.GetConnection().RemoteAddr(), req.GetMsgID(), string(req.GetData()))
}
func TestHeartbeatChecker_Clone(t *testing.T) {
hb := NewHeartbeatChecker(1)
//t.Log(len(hb.RouterSlices()), cap(hb.RouterSlices()))
new_hb := hb.Clone()

new_hb.BindRouterSlices(123,HeatBeatDefaultHandle)
new_hb.BindRouterSlices(123,HeatBeatDefaultHandle)
//t.Log(len(new_hb.RouterSlices()), cap(new_hb.RouterSlices()), new_hb.RouterSlices())

new_new_hb := new_hb.Clone()
//t.Log(len(new_new_hb.RouterSlices()), cap(new_new_hb.RouterSlices()),new_new_hb.RouterSlices())
new_new_hb.BindRouterSlices(123,HeatBeatDefaultHandle)
t.Log("new_new_hb",len(new_new_hb.RouterSlices()), cap(new_new_hb.RouterSlices()),new_new_hb.RouterSlices())
t.Log("new_hb",len(new_hb.RouterSlices()), cap(new_hb.RouterSlices()),new_hb.RouterSlices())

new_hb.BindRouterSlices(123,HeatBeatDefaultHandle111)
t.Log("new_new_hb",len(new_new_hb.RouterSlices()), cap(new_new_hb.RouterSlices()),new_new_hb.RouterSlices())
t.Log("new_hb",len(new_hb.RouterSlices()), cap(new_hb.RouterSlices()),new_hb.RouterSlices())
}
```

进行测试会发现，修改原始new_hb，new_new_hb会修改
```ruby
heartbeat_test.go:24: new_new_hb 4 4 [0x1022c2ed0 0x1022c2ed0 0x1022c2ed0 0x1022c2ed0]
heartbeat_test.go:25: new_hb 3 4 [0x1022c2ed0 0x1022c2ed0 0x1022c2ed0]
heartbeat_test.go:28: new_new_hb 4 4 [0x1022c2ed0 0x1022c2ed0 0x1022c2ed0 0x1022cc0e0]
heartbeat_test.go:29: new_hb 4 4 [0x1022c2ed0 0x1022c2ed0 0x1022c2ed0 0x1022cc0e0]
```