MDEV-13522: rocksdb.rocksdb_parts failed in buildbot

Make test result stable

storage/rocksdb/mysql-test/rocksdb/r/rocksdb_parts.result

@@ -49,7 +49,7 @@ set @tmp_rfirr= @@rocksdb_force_index_records_in_range;
 set rocksdb_force_index_records_in_range= 12;
 explain select * from t1 force index(col1) where col1=10;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref	col1	col1	5	const	24	
+1	SIMPLE	t1	ref	col1	col1	5	const	#	
 select * from t1 force index(col1) where col1=10;
 pk	col1	col2
 1	10	10

storage/rocksdb/mysql-test/rocksdb/t/rocksdb_parts.test

@@ -59,6 +59,7 @@ insert into t1 values (12,20,20);
 set @tmp_rfirr= @@rocksdb_force_index_records_in_range;
 set rocksdb_force_index_records_in_range= 12;
 
+--replace_column 9 #
 explain select * from t1 force index(col1) where col1=10;
 select * from t1 force index(col1) where col1=10;
 select * from t1 use index () where col1=10;