Patch #10

To repeat:
./mtr --charset-for-testdb=utf8mb4 --defaults-file=include/utf8mb4_my.cnf

ctype_collate
explain_json_all
explain_json_none
func_bitwise_ops
func_compress
func_like
innodb_pk_extension_off
innodb_pk_extension_on
insert_select
select_found
select_safe
subquery_mat
subquery_mat_all
subquery_mat_none

Change-Id: Ic4d6491daea4e87157ea9373394462174b70b566