OAK-1296: Use TypePredicate instead of NodeType.isNodeType() for NodeState type checks

The internal Node classes in PermissionHook are no longer needed after revision 1552409

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1552412 13f79535-47bb-0310-9956-ffa450edef68