Fix intermittent test failure in rocksdb.rocksdb_cf_per_partition

was getting rows=2 instead of 1 on kvm-rpm-centos74-amd64

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

@@ -353,7 +353,7 @@ Table	Op	Msg_type	Msg_text
 test.t2	analyze	status	OK
 EXPLAIN PARTITIONS SELECT  * FROM t2 WHERE col3 = 0x4 AND col2 = 0x34567;
 id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	custom_p2	ref	col3	col3	258	const	1	Using where
+1	SIMPLE	t2	custom_p2	ref	col3	col3	258	const	#	Using where
 DROP TABLE t2;
 CREATE TABLE `t2` (
 `col1` bigint(20) NOT NULL,

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

@@ -421,6 +421,7 @@ SELECT DISTINCT(cf_name) FROM information_schema.rocksdb_cfstats WHERE cf_name='
 
 # Verify that correct partition and key are used when searching.
 ANALYZE TABLE t2;
+--replace_column 10 #
 EXPLAIN PARTITIONS SELECT  * FROM t2 WHERE col3 = 0x4 AND col2 = 0x34567;
 
 DROP TABLE t2;