OO-538: fix unit test which set a persisted property without waiting the changes

src/test/java/org/olat/core/util/vfs/version/VersionManagerTest.java

@@ -150,6 +150,7 @@ public class VersionManagerTest extends OlatTestCase {
 	@Test
 	public void testOverflow_lowLevel() throws IOException {
 		versioningConfigurator.setMaxNumberOfVersionsProperty(new Long(3));
+		sleep(1000);
 		
 		//create a file
 		OlatRootFolderImpl rootTest = new OlatRootFolderImpl("/test_" + UUID.randomUUID(), null);
@@ -186,6 +187,7 @@ public class VersionManagerTest extends OlatTestCase {
 	@Test
 	public void testOverflow_lowLevel_deactivated() throws IOException {
 		versioningConfigurator.setMaxNumberOfVersionsProperty(new Long(0));
+		sleep(1000);
 		
 		//create a file
 		OlatRootFolderImpl rootTest = new OlatRootFolderImpl("/test_" + UUID.randomUUID(), null);