HDFS-5663 make the retry time and interval value configurable in openInfo()

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1552232 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5663 make the retry time and interval value configurable in openInfo()

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1552237 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5540. Fix intermittent failure in TestBlocksWithNotEnoughRacks. (Binglin Chang via junping_du)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1552256 13f79535-47bb-0310-9956-ffa450edef68