0.23 is not deploying JARs to Apache snapshots repo, thus you'll have to checkout hadoop and do a 'mvn install -DskipTests'
Once this is done you should be able to build/test Oozie against it using OOZIE-565 doing a 'mvn clean test -Dmr2 -Dhadoop.version=0.23.0-SNAPSHOT' Thanks. Alejandro
