Update changes for HADOOP-9832.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510796 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9817. FileSystem#globStatus and FileContext#globStatus need to work with symlinks. (Colin Patrick McCabe via Andrew Wang)



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510807 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5399. Unnecessary Configuration instantiation in IFileInputStream slows down merge. (Stanislav Barton via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510811 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd