Merge pull request kubernetes#67548 from neolit123/owners-kubectl

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>.

Add labels to kubectl OWNERS files

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

This change makes it possible to automatically add the two labels: `area/kubectl` and `sig/cli` to PRs that touch the paths in question.

this already exists for kubeadm:
https://github.com/kubernetes/kubernetes/blob/master/cmd/kubeadm/OWNERS#L17-L19

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
refs kubernetes/community#1808

**Special notes for your reviewer**:
none

**Release note**:

```release-note
NONE
```
/area kubectl
@kubernetes/sig-cli-pr-reviews 
/cc @cblecker @tpepper

cmd/kubectl/OWNERS

@@ -2,3 +2,6 @@ approvers:
 - sig-cli-maintainers
 reviewers:
 - sig-cli
+labels:
+- area/kubectl
+- sig/cli

pkg/kubectl/OWNERS

@@ -3,4 +3,5 @@ approvers:
 reviewers:
 - sig-cli
 labels:
+- area/kubectl
 - sig/cli