Fix test failure on innodb-wl5522

Added flush tables to avoid corruption of mtr/test_suppressions
table.

mysql-test/suite/innodb/r/innodb-wl5522.result

 call mtr.add_suppression("InnoDB: Unable to import tablespace .* because it already exists.  Please DISCARD the tablespace before IMPORT.");
+FLUSH TABLES;
 CREATE TABLE t1
 (a INT AUTO_INCREMENT PRIMARY KEY,
 b char(22),
@@ -1013,3 +1014,4 @@ DROP TABLE t1;
 call mtr.add_suppression("Got error -1 when reading table '.*'");
 call mtr.add_suppression("InnoDB: Error: tablespace id and flags in file '.*'.*");
 call mtr.add_suppression("InnoDB: The table .* doesn't have a corresponding tablespace, it was discarded");
+FLUSH TABLES;

mysql-test/suite/innodb/t/innodb-wl5522.test

@@ -4,6 +4,7 @@
 -- source include/have_innodb.inc
 
 call mtr.add_suppression("InnoDB: Unable to import tablespace .* because it already exists.  Please DISCARD the tablespace before IMPORT.");
+FLUSH TABLES;
 
 let $MYSQLD_TMPDIR = `SELECT @@tmpdir`;
 let $MYSQLD_DATADIR = `SELECT @@datadir`;
@@ -858,6 +859,7 @@ DROP TABLE t1;
 call mtr.add_suppression("Got error -1 when reading table '.*'");
 call mtr.add_suppression("InnoDB: Error: tablespace id and flags in file '.*'.*");
 call mtr.add_suppression("InnoDB: The table .* doesn't have a corresponding tablespace, it was discarded");
+FLUSH TABLES;
 
 # cleanup
 --remove_file $MYSQLTEST_VARDIR/tmp/t1.cfg