unify cobra args validation.

[yanggangtony]

Signed-off-by: yanggang gang.yang@daocloud.io

/kind cleanup

Let cobra args unify, for the validation logic.

[istio-testing]

Hi @yanggangtony. Thanks for your PR.

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[howardjohn]

this seems like a regression as we loose helpful error messages

[yanggangtony]

this seems like a regression as we loose helpful error messages

Hi, just close the pr , is that ok?

[zhlsunshine]

Hi @yanggangtony, why this unify args validation?

[yanggangtony]

Hi @yanggangtony, why this unify args validation?

@zhlsunshine
because i think it is can be done well by cobra .
And there are some place use cobra args validation , and some places not..
What's your point about these and do you think it is necesary?

[zhlsunshine]

Hi @yanggangtony, why this unify args validation?

@zhlsunshine because i think it is can be done well by cobra . And there are some place use cobra args validation , and some places not.. What's your point about these and do you think it is necesary?

Hi @yanggangtony, IMO, it's unnecessary to do this kind of verification