Add test case for

https://bugs.launchpad.net/percona-xtradb-cluster/+bug/1314854

mysql-test/suite/wsrep/r/foreign_key.result

+USE test;
+create table p(v varchar(20), i int, primary key(v,i)) engine=innodb character set = utf8;
+create table c(k int primary key, v varchar(20), i int, foreign key(v,i) references p(v,i)) engine=innodb character set = utf8;
+insert into p values (_utf32 0x000004100000041100000412, 1);
+insert into c values (1, _utf32 0x000004100000041100000412, 1);
+SELECT * FROM test.p;
+v	i
+???	1
+SELECT * FROM test.c;
+k	v	i
+1	???	1
+SELECT * FROM test.p;
+v	i
+???	1
+SELECT * FROM test.c;
+k	v	i
+1	???	1
+DROP TABLE c;
+DROP TABLE p;

mysql-test/suite/wsrep/t/foreign_key.opt

+--binlog-format=row --innodb_autoinc_lock_mode=2 --innodb_locks_unsafe_for_binlog=1 --wsrep-provider=$WSREP_PROVIDER --wsrep-cluster-address=gcomm://

mysql-test/suite/wsrep/t/foreign_key.test

+--source include/have_wsrep_enabled.inc
+--source include/have_innodb.inc
+
+USE test;
+create table p(v varchar(20), i int, primary key(v,i)) engine=innodb character set = utf8;
+create table c(k int primary key, v varchar(20), i int, foreign key(v,i) references p(v,i)) engine=innodb character set = utf8;
+insert into p values (_utf32 0x000004100000041100000412, 1);
+insert into c values (1, _utf32 0x000004100000041100000412, 1);
+
+SELECT * FROM test.p;
+SELECT * FROM test.c;
+
+SELECT * FROM test.p;
+SELECT * FROM test.c;
+
+# Cleanup
+DROP TABLE c;
+DROP TABLE p;
+