HBASE-8622 Remove ' You are currently running the HMaster without HDFS append support enabled. This may result in data loss. Please see the HBase wiki for details. ' from UI

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1486347 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.95' into 0.95-gd
Merge remote branch 'origin/0.95-gd' into fb-YAHOO-313-0.95-gd