dbus: systemd: Allow some fields to never be read

It's a common pattern in tacd codebase to collect all Topics
in a struct to make them available to e.g. the UI code.
These fields are not used, but should nevertheless be stored
in the respective struct to keep the common pattern.

Signed-off-by: Leonard Göhrs <[email protected]>

Author: hnez

src/dbus/systemd.rs

@@ -59,8 +59,11 @@ pub struct Service {
 #[derive(Clone)]
 pub struct Systemd {
     pub reboot: Arc<Topic<bool>>,
+    #[allow(dead_code)]
     pub networkmanager: Service,
+    #[allow(dead_code)]
     pub labgrid: Service,
+    #[allow(dead_code)]
     pub iobus: Service,
 }