Prettier worker list table; remove useless CLI log messages

src/table/merkle.rs

@@ -310,15 +310,13 @@ where
 	R: TableReplication + 'static,
 {
 	fn name(&self) -> String {
-		format!("{} Merkle tree updater", F::TABLE_NAME)
+		format!("{} Merkle", F::TABLE_NAME)
 	}
 
-	fn info(&self) -> Option<String> {
-		let l = self.0.todo_len().unwrap_or(0);
-		if l > 0 {
-			Some(format!("{} items in queue", l))
-		} else {
-			None
+	fn status(&self) -> WorkerStatus {
+		WorkerStatus {
+			queue_length: Some(self.0.todo_len().unwrap_or(0) as u64),
+			..Default::default()
 		}
 	}