级联菜单表单，defaultValue在disabled下失效

[lorrylockie]

Environment(required)

• antd version: 2.6.0
• Browser and its version: Chrome 最新版

What did you do? Please provide steps to re-produce your problem.

1. 复制官方级联菜单第一个例子的demo （Basic 的demo）
2. 在riddle 创建一个demo
3. 复制级联菜单组件，并排写两个组件，同时把第二个复制的级联菜单组件添加defaultValu属性
4. 3步骤后，级联菜单上默认就会选中defaultValue所指定的value
5. 在其中一个级联菜单上添加了disabled属性， 问题出现：defautValue 不生效

What do you expected?

disabled下，defaultValue也是生效的，以便能够展示一个禁用状态下，但是表单上有值的级联菜单

What happen?

没出现

Re-producible online demo

--deleted--

[lorrylockie]

@luolonghao

[afc163]

不要贴内网地址。

[lock]

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