重构并新增结点服务发现接口

cluster/servicediscovery.go

@@ -0,0 +1,15 @@
+package cluster
+
+type OperType int
+
+type FunDelNode func (nodeId int)
+type FunSetNodeInfo func(nodeInfo *NodeInfo)
+
+type IServiceDiscovery interface {
+	Init(localNodeId int) error
+	OnNodeStop()
+
+	RegFunDelNode(funDelNode FunDelNode)
+	RegFunSetNode(funSetNodeInfo FunSetNodeInfo)
+}
+