Automatic merge from submit-queue (batch tested with PRs 61452, 61727, 61462, 61692, 61738). 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>.

Update event-exporter image

This is a follow-up of https://github.com/GoogleCloudPlatform/k8s-stackdriver/pull/126 to apply the latest patch to the base image of event-exporter.

```release-note
[fluentd-gcp addon] Update event-exporter image to have the latest base image.
```

/assign @x13n 

Could you please take a look?