HADOOP-9016. HarFsInputStream.skip(long) must never return negative value. (Ivan A. Veselovsky via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1535088 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5363. Merge change r1535169 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1535183 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1535188 merging from trunk to branch-2 to fix HDFS-5341.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1535190 13f79535-47bb-0310-9956-ffa450edef68