fix: httpc支持ipv6 (#2125)

* fix: httpc支持ipv6

* httpc ip:port解析放在c层

* lua-socket.c listen增加ip:port字符串解析, 相关cluster代码修改 #2124

* socketchannel changehost port可置空

* socketchannel changehost恢复port判空

* httpc解析域名加端口号逻辑优化

* 注释中字符串模式内容格式优化

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Co-authored-by: zhuyin.zhu <zhuyin.zhu@bytedance.com>

service/clustersender.lua

@@ -60,10 +60,10 @@ end
 
 function command.changenode(host, port)
 	if not host then
-		skynet.error(string.format("Close cluster sender %s:%d", channel.__host, channel.__port))
+		skynet.error("Close cluster sender", channel.__host, channel.__port)
 		channel:close()
 	else
-		channel:changehost(host, tonumber(port))
+		channel:changehost(host, port)
 		channel:connect(true)
 	end
 	skynet.ret(skynet.pack(nil))