nixos: rename service 'ubuntu-fan' as 'fan'

nixos/modules/module-list.nix

···
   ./services/networking/dnsmasq.nix
   ./services/networking/docker-registry-server.nix
   ./services/networking/ejabberd.nix
+  ./services/networking/fan.nix
   ./services/networking/firefox/sync-server.nix
   ./services/networking/firewall.nix
   ./services/networking/flashpolicyd.nix
···
   ./services/networking/tlsdated.nix
   ./services/networking/tox-bootstrapd.nix
   ./services/networking/tvheadend.nix
-  ./services/networking/ubuntu-fan.nix
   ./services/networking/unbound.nix
   ./services/networking/unifi.nix
   ./services/networking/vsftpd.nix

nixos/modules/services/networking/ubuntu-fan.nix nixos/modules/services/networking/fan.nix

···
 
 let
 
-  cfg = config.networking.ubuntu-fan;
+  cfg = config.networking.fan;
   modprobe = "${config.system.sbin.modprobe}/sbin/modprobe";
 
 in
···
 
   options = {
 
-    networking.ubuntu-fan = {
+    networking.fan = {
 
-      enable = mkEnableOption "Ubuntu FAN Networking";
+      enable = mkEnableOption "FAN Networking";
 
     };
 
···
 
     environment.systemPackages = [ pkgs.fanctl ];
 
-    systemd.services.ubuntu-fan = {
-      description = "Ubuntu FAN Networking";
+    systemd.services.fan = {
+      description = "FAN Networking";
       wantedBy = [ "multi-user.target" ];
       after = [ "network-online.target" ];
       before = [ "docker.service" ];
···
         if [ ! -f /proc/sys/net/fan/version ]; then
           ${modprobe} ipip
           if [ ! -f /proc/sys/net/fan/version ]; then
-            echo "The Ubuntu Fan Networking patches have not been applied to this kernel!" 1>&2
+            echo "The Fan Networking patches have not been applied to this kernel!" 1>&2
             exit 1
           fi
         fi
 
-        mkdir -p /var/lib/ubuntu-fan
+        mkdir -p /var/lib/fan-networking
       '';
       serviceConfig = {
         Type = "oneshot";

pkgs/os-specific/linux/fanctl/default.nix

···
   # if that files does not exist, dnsmasq subsequently fails,
   # so we'll use /dev/null.
   #
-  # Also, make sure /var/lib/ubuntu-fan exists before starting dnsmasq.
+  # Also, make sure /var/lib/fan-networking exists before starting dnsmasq.
   buildPhase = ''
     substituteInPlace fanctl \
       --replace '--conf-file= ' \
···
                 '/var/lib/ubuntu-fan'
 
     sed -i '/dnsmasq -u/i \
-    mkdir -p /var/lib/ubuntu-fan' fanctl
+    mkdir -p /var/lib/fan-networking' fanctl
   '';
 
   installPhase = ''