HBASE-10631 Avoid extra seek on FileLink open

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1572892 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10627 A logic mistake in HRegionServer isHealthy (Shaohui)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1573016 13f79535-47bb-0310-9956-ffa450edef68