Change messages are Git commits and have an author set. We use this
author to serve the 'author' field on the REST API. The UI shows
the author on the very left of the change screen.
There is no need to mention this information in the message string
in addition. In fact, doing so makes showing a nice message harder
as the UI would have to parse out the account ID and resolve it.
Change-Id: I71fe4101666b496064691f07e92c2b912f6fe2e7
473a70b58f