Use the default namespace in the kubeconfig

[superbrothers]

hns command will fail to execute if the -namespace option is not specified.

$ kubectl hns create foo
Error: parent must be set via --namespace or -n

On the other hand, kubectl uses the default namespace set in kubeconfig if not specified. I think hns command's behavior should be aligned with kubectl's.

What do you think?

[yanggangtony]

+1 Make sense for me.

[superbrothers]

I'll make a PR.

[yanggangtony]

I have done it. wait.

[superbrothers]

OK. Thanks.

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