MODE-2354. JcrTools authorization fix alternative

Patch for findOrCreateChild to avoid getting ancestral nodes that aren't necessary for the current operation, because in ACL context AccessDeniedException would be thrown if the user doesn't have access to those ancestors.
there is already a method in `AbstractJcrRepositoryTest` (the grandparent test class) : `protected AccessControlList acl( String path )`. Please use that to retrieve the ACL for the node and that should simply the code to smth like:
```
AccessControlList acl = acl("/node");
AccessControlManager accessControlManager = session.getAccessControlManager();
acl.addAccessControlEntry(...)
etc
```