~修复部分情况下向systemd输出大量无用日志的bug

~修复首次使用6-2时倒入失败的bug
~尝试修复部分设备因ipv6导致的dns劫持失败的问题

scripts/shellcrash.service

@@ -6,8 +6,8 @@ After=network.target
 Type=simple
 User=shellcrash
 ExecStartPre=/etc/ShellCrash/start.sh bfstart
-ExecStart=/etc/ShellCrash/CrashCore run -D /etc/ShellCrash -C /tmp/ShellCrash/jsons
-ExecStartPost=/etc/ShellCrash/start.sh afstart >/dev/null &
+ExecStart=/etc/ShellCrash/CrashCore run -D /etc/ShellCrash -C /tmp/ShellCrash/jsons >/dev/null
+ExecStartPost=/etc/ShellCrash/start.sh afstart
 ExecStopPost=/etc/ShellCrash/start.sh stop_firewall ; /etc/ShellCrash/start.sh unset_proxy
 Restart=on-abnormal
 RestartSec=10s