Revert "HBASE-11876 RegionScanner.nextRaw should not update metrics"

This reverts commit 23a4181d1ecc5f492c16dc579bff92eef7d209f1.
HBASE-11876 RegionScanner.nextRaw should not update metrics
HBASE-11887 Memory retention in branch-1; millions of instances of LiteralByteString for column qualifier and value
HBASE-11886 The creator of the table should have all permissions on the table (Devaraj Das and Andrew Purtell)
Update CHANGES.txt for 0.98.6RC2