HDFS-5283. Under construction blocks only inside snapshots should not be counted in safemode threshhold.  Contributed by Vinay


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532857 13f79535-47bb-0310-9956-ffa450edef68
Add TestOpenFilesWithSnapshot.java for HDFS-5283.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532860 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5585. TestCopyCommitter#testNoCommitAction Fails on JDK7 (jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1532875 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