Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Format some import statements in scheduler pkg

**What this PR does / why we need it**:

As the title says, apply `goimports` on some files under `pkg/scheduler` pkg.

**Release note**:

```release-note
NONE
```