OAK-672: Avoid JCR APIs calling other JCR APIs
- Simplify VersionManagerImpl and VersionManagerDelegate

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1456033 13f79535-47bb-0310-9956-ffa450edef68
OAK-672: Avoid JCR APIs calling other JCR APIs
- Add QueryManager to SessionContext

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1456034 13f79535-47bb-0310-9956-ffa450edef68