This code is used to rebuild meta off line from file system data. If there
are any problem detected, it will fail suggesting actions for the user to do
to "fix" problems. If it succeeds, it will backup the previous .META. and
-ROOT- dirs and write new tables in place.
This is an advanced feature, so is only exposed for use if explicitly
hbase org.apache.hadoop.hbase.util.hbck.OfflineMetaRepair ...