apiserver-runtime-gen easier to use

[zhiyu0729]

1. --install is not exist, it should be --install-generators here.
2. if not go file in current dir. go mod why output nothing. use modfile replace it.

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[yue9944882]

/lgtm
/approve

thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yue9944882, zhiyuone

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