HDFS-6614. Addendum patch to shorten TestPread run time with smaller retry timeout setting. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608846 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10781. Unportable getgrouplist usage breaks FreeBSD (Dmitry Sivachenko via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608869 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6638. Shorten test run time with a smaller retry timeout setting. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608905 13f79535-47bb-0310-9956-ffa450edef68
move HADOOP-10781 to 2.6

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608936 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6627. Rename DataNode#checkWriteAccess to checkReadAccess. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608940 13f79535-47bb-0310-9956-ffa450edef68