Rework APIs of new getChildAssocs with result count limit

- Use regular pattern of get -> select in the DAO
 - All getChildren* batching done after the query
 - Unit tests
 - In progress: Added option (low level select only) to constrain by assoc ID


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@31318 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/domain/node/ChildAssocEntity.java

@@ -185,7 +185,7 @@ public class ChildAssocEntity
      */
     public ChildAssocEntity()
     {
-        ordered = true;
+        ordered = false;
     }
 
     @Override