v1.9登录容器异常

[wth12138]

What happened:
使用v1.9.2版本编译的platform代码，进行容器登录时发生崩溃
What you expected to happen:

How to reproduce it (as minimally and precisely as possible):
任意容器，登录
Anything else we need to know?:
execHandler 中
reqClone的header被主动设置为空，uRoundTrip方法会返回nil，再获取request会抛空指针异常
Environment:

• TKE version:
• Global or business cluster:
• Kubernetes version (use kubectl version):
• Install addons:
• Others: