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>.
Support completions for --clusterrole of kubectl create clusterrolebinding
**What this PR does / why we need it**:
This PR supports completion for --clusterrole of kubectl create clusterrolebinding.
```
$ kubectl create clusterrolebinding hoge --clusterrole <tab>
admin system:controller:daemon-set-controller system:controller:node-controller system:controller:service-controller system:kube-scheduler
cluster-admin system:controller:deployment-controller system:controller:persistent-volume-binder system:controller:statefulset-controller system:node
edit system:controller:disruption-controller system:controller:pod-garbage-collector system:controller:ttl-controller system:node-bootstrapper
system:auth-delegator system:controller:endpoint-controller system:controller:replicaset-controller system:discovery system:node-problem-detector
system:basic-user system:controller:generic-garbage-collector system:controller:replication-controller system:heapster system:node-proxier
system:controller:attachdetach-controller system:controller:horizontal-pod-autoscaler system:controller:resourcequota-controller system:kube-aggregator system:persistent-volume-provisioner
system:controller:certificate-controller system:controller:job-controller system:controller:route-controller system:kube-controller-manager view
system:controller:cronjob-controller system:controller:namespace-controller system:controller:service-account-controller system:kube-dns
```
**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**:
I feel that it is better to except system clusterroles from completion candidates. What do you think about it?
**Release note**:
```release-note
Support completion for --clusterrole of kubectl create clusterrolebinding
```
Automatic merge from submit-queue (batch tested with PRs 50023, 50639)
Correct case for starting character of option string
**What this PR does / why we need it**:
Kubectl-conventions.md states:
"Flag descriptions should start with an uppercase letter and not have a period at the end of a sentence"
There are numerous cases where this is violated in `kubectl/cmd`. This PR is the result of an audit of all source files under `kublet/cmd` and corrects the case of the initial Flag description character.
/sig cli
/kind cleanup
/kind documentation
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 47034, 50329)
Fix comments
**What this PR does / why we need it**:
**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**:
**Release note**:
```release-note
NONE
```
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