config: send server-side capabilities to config

src/config.rs

@@ -203,6 +203,7 @@ impl ConfigProxy {
     }
 
     pub fn configure(&self, reload: bool) {
+        self.send(&ServerMessage::Features { features: vec![] });
         self.send(&ServerMessage::Configure { reload });
     }
 

src/it/test_config.rs

@@ -109,6 +109,7 @@ unsafe extern "C" fn handle_msg(data: *const u8, msg: *const u8, size: usize) {
         ServerMessage::Idle => {}
         ServerMessage::DevicesEnumerated => {}
         ServerMessage::InterestReady { .. } => {}
+        ServerMessage::Features { .. } => {}
     }
 }