Configuration details that need to be cleaned up
- the documentation around configuring cleaner plugins have stale class names for customizing behavior.
- hbase.master.logcleaner.plugins has LogCleanerDelegate and I think the correct class is BaseLogCleanerDelegate.
- hbase.master.hfilecleaner.plugin has HFileCleanerDelegate instead of BaseHFileCleanerDelegate.
- hbase.rpc.server.engine doesn't appear anywhere other than hdfs-default.xml and the classes it references were removed by