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

Use TypePredicate in PermissionHook
Also make the child order property type to be NAMES instead of STRINGS

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1552409 13f79535-47bb-0310-9956-ffa450edef68