Cannot use 2 verbs at the same time

**Issue by [dmikov](https://github.com/dmikov)**
_Monday Oct 30, 2017 at 16:05 GMT_
_Originally opened as https://github.com/gsscoder/commandline/issues/497_

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I have 2 verbs `upgrade` and `validate`, upgrade has 2 options `v` and `c`, the validate has 1 option `f`. If I use them separately it all works, if I put 2 verbs together on command line I am getting the `UnknownOptionError` from second verb option. i.e if the `upgrade` is first, then `f` on `validate` causes the error, if `validate` is first then `v` and `c` cause an error.

该 issue 没有指明文件或测试。首先，在两种动词顺序下复现包含 upgrade 和 validate 的命令行场景，然后跟踪多动词选项解析路径。当两个动词同时出现时，每个动词都能接受自己的选项且不出现 UnknownOptionError，即表示完成。

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