Change email address used for daily build results.

This is a workaround until the jenkins service account can send email
to the LaunchPad firefighters d-list.  The members of the list in the
layout.yaml file will forward the daily build results email to the
LaunchPad firefighters d-list.

Change-Id: I6f6f1fe5fb298c790a6a24e92b2a40a893a362e0