OAK-1860 - add fwk for concurrent DS tests, improve concurrency handling in RDBDocumentStore

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1597804 13f79535-47bb-0310-9956-ffa450edef68
OAK-1522 - Provide PojoSR based RepositoryFactory implementation

Disabling the module untill various issues are resolved

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1597809 13f79535-47bb-0310-9956-ffa450edef68