Please provide any additional information below.
Right now, it's possible to add multiple review requests with the same
changeset number. This shouldn't be possible.
Through the web UI, an error should be displayed when adding a review
request with a change number already in use.
post-review should call a yet-to-be-written JSON API function to find if
there's an existing review request with the change number, and if it finds
one and the owner matches, it should update the information in that review
request.
