[advanced audit api] fuzz Event with random value
[advanced audit api] fuzz Event with random value

This is an error import by me:
https://github.com/kubernetes/kubernetes/pull/49115

We need to fuzz other parts of Event with random value, otherwise
this round trip test will not make too much sense.
@sttts @ericchiang

Kubernetes-commit: f2ec610455f3756afebfcbd99c108abc86a5015d

kubernetes/apiserver,caesarxuchao/apiserver,caesarxuchao/apiserver,kubernetes/apiserver,caesarxuchao/apiserver