Sort result from table_statistics and index_statistics

This is needed as the order of rows are not deterministic,
especially in future versions of table statistics.

mysql-test/main/subselect.test

@@ -5932,7 +5932,9 @@ WHERE SLEEP(0.1) OR c < 'p' OR b = ( SELECT MIN(b) FROM t2 );
 --enable_ps2_protocol
 
 --echo # The following shows that t2 was indeed scanned with a full scan.
+--sorted_result
 show table_statistics;
+--sorted_result
 show index_statistics;
 set global userstat=@tmp_mdev410;