Fix failing test with junit upgrade (#64)

diff --git a/core-integ/src/test/java/org/apache/directory/server/core/operations/modify/ModifyMultipleChangesIT.java b/core-integ/src/test/java/org/apache/directory/server/core/operations/modify/ModifyMultipleChangesIT.java
index 1e2f582..733542b 100644
--- a/core-integ/src/test/java/org/apache/directory/server/core/operations/modify/ModifyMultipleChangesIT.java
+++ b/core-integ/src/test/java/org/apache/directory/server/core/operations/modify/ModifyMultipleChangesIT.java
@@ -78,7 +78,7 @@
      * @throws Exception on errors
      */
     @BeforeAll
-    private static void createData() throws Exception
+    public static void createData() throws Exception
     {
         try ( LdapConnection conn = IntegrationUtils.getAdminConnection( classDirectoryService ) )
         {