HBASE-11868 Data loss in hlog when the hdfs is unavailable (Liu Shaohui)
HBASE-11878 TestVisibilityLabelsWithDistributedLogReplay#testAddVisibilityLabelsOnRSRestart sometimes fails due to VisibilityController not yet initialized
HBASE-11863 WAL files are not archived and stays in the WAL directory after splitting
HBASE-11876 RegionScanner.nextRaw should not update metrics
Revert "HBASE-11868 Data loss in hlog when the hdfs is unavailable (Liu Shaohui)"

This reverts commit fd10bde5af20d6db96207cc2e29b779e117acf19.
Update CHANGES.txt for 0.98.6RC1