新增网络socket的系统调用接口 (#247)

1.修复spinlock忘记恢复rflags的问题
2.WaitQueue增加wakeup_all的功能
3.完善tcp,udp,raw socket
4.把PollStatus结构体改为使用bitflags
5.新增iovec结构体
6.完成网络的系统调用
7.在bootstrap里面添加dnsmasq bridge-utils iptables

---------

Co-authored-by: guanjinquan <1666320330@qq.com>

tools/qemu/ifdown-nat

@@ -0,0 +1,24 @@
+#!/bin/bash
+BRIDGE=dragonos-bridge
+if [ -n "$1" ]; then
+        echo "正在断开接口 $1"
+        ip link set $1 down
+        brctl delif "$BRIDGE" $1
+        tap=`brctl show | grep natnet | awk '{print $4}'`
+        if [[ $tap != tap* ]];then
+            ip link set "$BRIDGE" down
+            brctl delbr "$BRIDGE"
+            iptables -t nat -F
+            kill `ps aux | grep dnsmasq | grep -v grep | awk '{print $2}'`
+            echo "断开接口 $1 成功"
+            echo "网桥 $BRIDGE 卸载成功"
+            echo "dnsmasq 服务停止成功"
+            exit 0
+        else
+            echo "断开接口 $1 成功"
+            exit 0
+        fi
+else
+        echo "删除错误：未指定接口"
+        exit 1
+fi