menu 组件内部使用 a 标签时，应该覆盖掉 a:focus { text-decration: underline } 样式

[sun4cs]

Version

2.9.1

Environment

macOS, chrome 57

Reproduction link

https://ant.design/docs/react/introduce-cn

Steps to reproduce

https://ant.design/docs/react/introduce-cn
点击顶部导航菜单

What is expected?

针对 menu 组件内的 a 标签默认不要有下划线，也就是覆盖到默认的 a:focus 样式，之前并没有这个样式

What is actually happening?

点击 menu 组件内部的 a 标签，会触发 a:focus { text-decration: underline }

[sun4cs]

[afc163]

来个 PR 吧。

[lock]

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