HBASE-8712  HFileLinkCleaner (FSUtils.listStatus) logs too much if
            links do not exists (Matteo via JD)


git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1490871 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8690 Reduce unnecessary getFileStatus hdfs calls in TTL hfile and hlog cleanners (Shaohui)



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1490886 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-666-trunk-gd