Remove some unnecessary import renames.

[monopole]

and an unnecessary creation of empty struct

[k8s-ci-robot]

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[mengqiy]

IIRC if there is a - in the package name, goimports linter will ask for an name alias.

[mengqiy]

IIRC if you remove this goimports linter will complain about this.

[monopole]

Absolutely true. That's why i disabled the goimports check in pre-commit.sh a while back (that's why this PR is passing).

goimports is broken for the case where the actual location of code has a hyphen, but the code itself has a package name that doesn't have a hyphen, e.g.

location: https://github.com/krishicks/yaml-patch
package name: https://github.com/krishicks/yaml-patch/blob/94f42521ff99ba62ddeca5ddae47264ade0b8df6/patch.go#L1

There's confusing discussion around this issue in golang/go#17546

I want to remove these aliases because the goland linter is (correctly) flagging them as unnecessary, and seeing these reports is adding noise to the report, making it more difficult to see real problems.

[Liujingfang1]

/lgtm