Automatic merge from submit-queue

remove useless code in kubelet

**What this PR does / why we need it**:
This code has logical error as the etc-hosts file will be recreated even it already exists. In addition, if do not recreate etc-hosts file when it exists, the pod ip in it will be out of date when pod ips change. So remove this code as it is not needed.

**Which issue this PR fixes**: 

**Special notes for your reviewer**:
xrefer: #44481, #44473

**Release note**:
```release-note
NONE
```