MAPREDUCE-6006. native-task: add native tests to maven and fix bug in pom.xml. Contributed by Binglin Chang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/MR-2841@1617877 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-6026. native-task: fix logging. Contributed by Manu Zhang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/MR-2841@1617878 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-6035. native-task: sources/test-sources jar distribution. Contributed by Manu Zhang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/MR-2841@1617879 13f79535-47bb-0310-9956-ffa450edef68