Automatic merge from submit-queue (batch tested with PRs 50890, 52484, 52542, 52567, 50672). 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>..
fix kubectl get cronjob lose age info
**What this PR does / why we need it**:
relate with #20941
befere output:
```
NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
pi 0/5 * * * ? False 1 Thu, 14 Sep 2017 20:10:00 +0800
```
now output:
```
admindeMacBook-Pro-2:kubectl admin$ ./kubectl get cronjob
NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGE
pi 0/5 * * * ? False 1 3m 4m
```
**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**:
thanks
**Release note**:
```release-note
NONE
```