Add decision on SVN commit format

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1559919 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10391 Deprecate KeyValue#getBuffer

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1559935 13f79535-47bb-0310-9956-ffa450edef68