Automatic merge from submit-queue

scheduler: fix validation test
Signed-off-by: sakeven <jc5930@sina.cn>



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

Without setting `Weight`, `ValidatePolicy` will report
```
Priority for extender http://127.0.0.1:8081/extender should have a positive weight applied to it
```

**Besides**, it seems it's not a good way to test ValidatePolicy by```if ValidatePolicy(extenderPolicy) == nil```, because we can't determine specific reason which causes error.

**Special notes for your reviewer**:

**Release note**:

```
NONE
```