HBASE-10066. Use ByteArrayOutputStream#writeTo where appropriate

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1547294 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9997  Add per KV security details to HBase book

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1547300 13f79535-47bb-0310-9956-ffa450edef68