HADOOP-10780. hadoop_user_info_alloc fails on FreeBSD due to incorrect sysconf use (trtrmitya via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1610470 13f79535-47bb-0310-9956-ffa450edef68
HDFS-2856. Fix block protocol so that Datanodes don't require root or jsvc. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1610474 13f79535-47bb-0310-9956-ffa450edef68