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 remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4311-trunk-gd