Added some dependencies for the linux init script

* $remote_fs : we need /usr, right? :)
* $network : for startup, you want to have all the interfaces up because in the config you can specify a certain interface. If we try to start without that iface, we will fail to bind to the socket. For shutdown, you want to stall the network from going down so you can finalize certain client connections cleanly.
* $named : in the config, you can specify a hostname in place of an address, so we need any DNS servers up before we start. We can shutdown before the DNS server, though, since we already have the hostname resolved.