HADOOP-10313. Script and jenkins job to produce Hadoop release artifacts. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1563043 13f79535-47bb-0310-9956-ffa450edef68
Add .classpath, .project, .settings and target to svn:ignore.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1563063 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5856. DataNode.checkDiskError might throw NPE. Contributed by Josh Elser.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1563064 13f79535-47bb-0310-9956-ffa450edef68