connect static nodes (#1016)

* update buildall.bat

* use static nodes to connect

* set getDebtByHash api to be public

* Check if nodeId is empty

* node start config maxConns and maxActiveConns

* set maxConnsPerShardPerIp

* set max connections limit for single IP

* fix log import bug

* init log

* set message log level to debug

* fix ipSet bug

* fix set maxActiveConnections bug

* limit peer announceRequestCode frequency

* log sendAnnounce entry

* test chainHeaderChange not sendAnnounce every time

* remove other requestTime limits, just in blockLoop, for Test

* clean code and refactor

* fix some typos

* limit peer handling announceCode frequency

* log handshaked peerNodeID

* add log

* vm toll add fee parameter and fix nonce bug

* add seele rpc api getShardNum

* try to connect static node if its config likes "snode://nodeid@ip:port[shardNum]"

p2p/server.go

@@ -351,26 +351,14 @@ running:
 // doSelectNodeToConnect selects one free node from nodeMap to connect
 func (srv *Server) doSelectNodeToConnect() {
 
-	var nodeID [maxConnsPerShard]*discovery.Node
-	index := 0
 	for _, node := range srv.StaticNodes {
 		if node.ID.IsEmpty() || srv.checkPeerExist(node.ID) {
 			continue
 		} else {
-			nodeID[index] = node
-			index++
+			srv.connectNode(node)
 		}
-
 	}
-	srv.nodeSet.lock.RLock()
-	for i := 0; i < index; i++ {
-		if _, ok := srv.nodeSet.nodeMap[nodeID[i].ID]; ok {
-			srv.connectNode(nodeID[i])
-
-		}
 
-	}
-	srv.nodeSet.lock.RUnlock()
 	var node *discovery.Node
 	i := 0
 	for i < maxConnsPerShard {