Show new change URLs in the body of the new change email

Some email clients hide the signature section of an email
automatically.  If there are no reviewers listed on a new change,
such as when a change is pushed over HTTP and a notification is
automatically sent out to any subscribed watchers, the URL was
hidden inside of the signature and not readily available.

Show the URL right away in the body.

Change-Id: I643d3bd51b9be9273fc9601755622847e7d2d258
1 file changed