Fix a sporadic failure of main.backup_locks

Ever since commit 9608773
the InnoDB persistent statistics are enabled on all InnoDB tables
by default. We must filter out any output that indicates that the
statistics tables are being internally accessed by InnoDB.

mysql-test/main/backup_locks.result

@@ -32,7 +32,7 @@ a
 connection con1;
 drop table t1;
 connection default;
-SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
+SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info where table_name not like "innodb_%";
 LOCK_MODE	LOCK_TYPE	TABLE_SCHEMA	TABLE_NAME
 MDL_SHARED_HIGH_PRIO	Table metadata lock	test	t1
 MDL_INTENTION_EXCLUSIVE	Schema metadata lock	test	

mysql-test/main/backup_locks.test

@@ -39,7 +39,7 @@ let $wait_condition=
     select count(*) = 1 from information_schema.processlist
     where state = "Waiting for table metadata lock";
 --source include/wait_condition.inc
-SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info;
+SELECT LOCK_MODE, LOCK_TYPE, TABLE_SCHEMA, TABLE_NAME FROM information_schema.metadata_lock_info where table_name not like "innodb_%";
 --error ER_LOCK_DEADLOCK
 select * from t1;
 backup unlock;