Fixes typo in ReloadableEntityManagerFactoryTest which breaks the test with OpenJPA 3.2.0

(cherry picked from commit 0a18103f9c670b1fee0739a8ff1ec97ed6b963a8)
diff --git a/container/openejb-core/src/test/java/org/apache/openejb/persistence/ReloadableEntityManagerFactoryTest.java b/container/openejb-core/src/test/java/org/apache/openejb/persistence/ReloadableEntityManagerFactoryTest.java
index e133e34..c274f11 100644
--- a/container/openejb-core/src/test/java/org/apache/openejb/persistence/ReloadableEntityManagerFactoryTest.java
+++ b/container/openejb-core/src/test/java/org/apache/openejb/persistence/ReloadableEntityManagerFactoryTest.java
@@ -46,7 +46,7 @@
         unit.addClass(MyEntity.class);
         unit.setProperty("openjpa.jdbc.SynchronizeMappings", "buildSchema(ForeignKeys=true)");
         unit.getProperties().setProperty("openjpa.RuntimeUnenhancedClasses", "supported");
-        unit.getProperties().setProperty("openjpa.DatCache", "false");
+        unit.getProperties().setProperty("openjpa.DataCache", "false");
         unit.setExcludeUnlistedClasses(true);
 
         final Persistence persistence = new org.apache.openejb.jee.jpa.unit.Persistence(unit);