Rename file to show that this is for exit, not restart
Don't manage keep-alive connections, let them time out on their own

Also switch to a model of just being a function, and not attaching to any signals
Let the keep-alive connections continue on, but give them a 1ms idle timeout to get them out of here
Change default suicide timeout to 2m10s

Nodejs sets a default keep-alive timeout of 2m, so this should be big enough to allow all connections to idle out. However, if a web request takes more than 10 seconds and it is a keep-alive connection, we will ungracefully exit that connection if it becomes idle