MDEV-12120 tokudb_bugs.xa-N tests fail with timeout on valgrind

The tests are disabled for valgrind in 5.6/10.x (LP:1549196),
so they should be disabled in 5.5 as well

storage/tokudb/mysql-test/tokudb_bugs/t/xa-3.test

@@ -2,6 +2,7 @@
 -- source include/have_tokudb.inc
 -- source include/have_debug.inc
 -- source include/not_embedded.inc
+-- source include/not_valgrind.inc
 
 --disable_warnings
 drop table if exists t1, t2;

storage/tokudb/mysql-test/tokudb_bugs/t/xa-4.test

@@ -2,6 +2,7 @@
 -- source include/have_tokudb.inc
 -- source include/have_debug.inc
 -- source include/not_embedded.inc
+-- source include/not_valgrind.inc
 
 --disable_warnings
 drop table if exists t1, t2;

storage/tokudb/mysql-test/tokudb_bugs/t/xa-6.test

 --source include/have_tokudb.inc
 --source include/have_debug.inc
+-- source include/not_valgrind.inc
 
 --disable_warnings
 drop table if exists t1;