HADOOP-10624. Fix some minor typos and add more test cases for hadoop_err (pengwenwu2008 via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HADOOP-10388@1598774 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10444. Add pom.xml infrastructure for hadoop-native-core (decstery via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HADOOP-10388@1598780 13f79535-47bb-0310-9956-ffa450edef68
add svn ignore to target directory

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HADOOP-10388@1598781 13f79535-47bb-0310-9956-ffa450edef68