Revert " Releasing the list items when list destructor is called"

This reverts commit 7579ae3086.

opal/class/opal_list.c

@@ -97,17 +97,11 @@ static void opal_list_construct(opal_list_t *list)
 
 
 /*
- * Release the list items in the list.
- * Reset list pointers to be NULL
+ * Reset all the pointers to be NULL -- do not actually destroy
+ * anything.
  */
 static void opal_list_destruct(opal_list_t *list)
 {
-    opal_list_item_t *it;
-
-    while (NULL != (it = opal_list_remove_first(list))) {
-        OBJ_RELEASE(it);
-    }
-
     opal_list_construct(list);
 }