- Fix some golint errors for `pkg/kubectl`
- Fix a golint error for `pkg/kubectl/apps`
- Fix all golint errors for `pkg/kubectl/cmd`
- Fix some golint errors for `pkg/kubectl/generate/versioned`
- Fix a golint error for `pkg/kubectl/generate`
- Fix some golint errors for `pkg/kubectl/metricsutil`
- Fix all golint errors for `pkg/kubectl/util`
- Fix all golint errors for `pkg/kubectl/util/slice`
Automatic merge from submit-queue (batch tested with PRs 51771, 52971). 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>.
pass labelSelector to server side opaquely
**What this PR does / why we need it**:
From @smarterclayton
> The server is responsible for handling label selection for the most part. There is some level of client side processing possible, but for the most part `label selector` should be able to be passed opaquely.
xref #50140
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
/assign @smarterclayton @liggitt
**Release note**:
```release-note
None
```
Automatic merge from submit-queue (batch tested with PRs 45835, 45389)
Introduce visibility rules to kubernetes code.
**What this PR does / why we need it**:
Use rules to identify "bad" dependencies on kubectl code for later refactoring or removal, and prevent their reintroduction.
**Which issue this PR fixes**
First in a series of PRs to address kubernetes/community#598
**Release note**:
```release-note
NONE
```
**What this PR does / why we need it**:
Visibility rules allow dependency control. The rules currently in
place make all targets public, to override the default state of
private. This PR removes public visibility from kubectl code. It
uses specially named pacakge groups to identify "bad" dependencies on
kubectl code for later refactoring or removal.
**Which issue this PR fixes**
First in a series of PRs to address kubernetes/community#598
**Release note**:
```release-note
NONE
```
