Automatic merge from submit-queue

fixed the logging of which conversions.

Hi Guys,

After enable the function of logging of which conversions at [TestSpecificKind](https://github.com/jianzhangbjz/kubernetes/blob/d31a7cb301468323d91b962cb7aefeea9101e107/pkg/api/serialization_test.go#L140), I got the below errors:
```
pkg/api/serialization_test.go:140: cannot refer to unexported name api.scheme
pkg/api/serialization_test.go:140: undefined: api.scheme in api.scheme.Log
ok  	k8s.io/kubernetes/cmd/genutils	0.066s
```
So, this PR will fix that.