Netflix uses daemontools in their BaseAMI[1] for starting up core services such as Apache and Tomcat. I think this choice was originally made to ensure consistency in process startup methods across CentOS and Ubuntu. Support for automatically creating daemontools scripts is baked into nebula-ospackage-plugin[2].

[1] http://techblog.netflix.com/2013/03/ami-creation-with-aminat...

[2] https://github.com/nebula-plugins/nebula-ospackage-plugin