HBASE-10805 Speed up KeyValueHeap.next() a bit

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1580147 13f79535-47bb-0310-9956-ffa450edef68
Add missing tracing.xml

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1580162 13f79535-47bb-0310-9956-ffa450edef68