OAK-1789: Upgraded version history has UUIDs as jcr:frozenUuid of non-referenceable nodes

Automatically convert UUIDs to path identifiers where needed.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1591704 13f79535-47bb-0310-9956-ffa450edef68