Remove AUTHORS file from packaging scripts

Change-Id: I12f30417fdf3f3b54cde1ff1f6daf1e6ef4ed303
Reviewed-on: http://review.couchbase.org/43703
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>