Automatic merge from submit-queue

Fix golint verify error

I don't know why CI pass the hack/verify-golint.sh test.
But in my environment I get this:

> staging/src/k8s.io/client-go/util/workqueue/queue_test.go is in package workqueue_test, not workqueue
Errors from golint:
test/integration/apiserver/apiserver_test.go:102:13: should omit type string from declaration of var cascDel; it will be inferred from the right-hand side
Please fix the above errors. You can test via "golint" and commit the result.
!!! Error in hack/verify-golint.sh:98
  Error in hack/verify-golint.sh:98. 'false' exited with status 1
Call stack:
  1: hack/verify-golint.sh:98 main(...)
Exiting with status 1

This change fix this err in my environment.
**Release note**:

```NONE
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