Fix line delimited JSON response

For GET /events, line delimit JSON.
Fixes #7047

Signed-off-by: Jessica Frazelle <jfrazelle@users.noreply.github.com>
I'm not sure about this code. You can only test that answer is EOL-delimited by this :) It should be in your test I think. Here I think should be only:
```
ioutil.ReadAll(resp.Body)
```