新增：连接健康检查

git-svn-id: svn://47.119.165.148/zhub@123 e63fbceb-bcc3-4977-ac22-735b83d8d0f4

zsub/msg-consumer.go

@@ -4,6 +4,7 @@ import (
 	"log"
 	"strconv"
 	"strings"
+	"time"
 	"zhub/conf"
 )
 
@@ -22,6 +23,12 @@ func msgAccept(v Message) {
 		return
 	}
 
+	// ping reply
+	if strings.EqualFold("+pong", v.Rcmd[0]) {
+		v.Conn.pong = time.Now().Unix()
+		return
+	}
+
 	if conf.LogDebug {
 		log.Println("rcmd: " + strings.Join(rcmd, " "))
 	}