Add note about daemontools.

I am of the mind that it should not be added, but I won't stop anyone
if they garner 3 +1s from actual testing and feedback.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@93638 13f79535-47bb-0310-9956-ffa450edef68