Add --allow-dead-slots argument to slot/print/json commands (#9408)

automerge

ledger-tool/tests/basic.rs

@@ -31,7 +31,7 @@ fn bad_arguments() {
 fn nominal() {
     let genesis_config = create_genesis_config(100).genesis_config;
     let ticks_per_slot = genesis_config.ticks_per_slot;
-    let meta_lines = 1;
+    let meta_lines = 2;
 
     let (ledger_path, _blockhash) = create_new_tmp_ledger!(&genesis_config);
     let ticks = ticks_per_slot as usize;