HBASE-8522 Archived hfiles and old hlogs may be deleted immediately by HFileCleaner, LogCleaner in HMaster (Shaohui)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1485872 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.94' into 0.94-gd
Merge remote branch 'origin/0.94-gd' into fb-HBASE-8508-0.94-gd