OAK-562: Clean up duplicate name conversion in plugins/nodetype

Avoid extra Oak-JCR-Oak name mappings in registerNodeTypes() by moving
the code that writes the type definition nodes from ReadWriteNTM to the
template classes that have direct access to the underlying Oak names.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1434626 13f79535-47bb-0310-9956-ffa450edef68