YARN-1335. Move duplicate code from FSSchedulerApp and FiCaSchedulerApp into SchedulerApplication (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1535582 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5171. NFS should create input stream for a file and try to share it with multiple read requests. Contributed by Haohui Mai

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1535586 13f79535-47bb-0310-9956-ffa450edef68
merge trunk to hdfs-4949 branch

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4949@1535608 13f79535-47bb-0310-9956-ffa450edef68