HDFS-4491. Parallel testing HDFS. Contributed by Andrey Klochkov.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520479 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4491. Add/delete files missed in prior commit.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520482 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5164.  DeleteSnapshot should check if OperationCategory.WRITE is possible before taking write lock (contributed by Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520492 13f79535-47bb-0310-9956-ffa450edef68
HDS-5118. Provide testing support for DFSClient to drop RPC responses. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520637 13f79535-47bb-0310-9956-ffa450edef68
Move HDFS-5118 to 2.1.1-beta section.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520650 13f79535-47bb-0310-9956-ffa450edef68
Fixing CHANGES.txt for YARN-758 as it is now merged into branch-2.1-beta.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520659 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4879. Add BlockedArrayList collection to avoid CMS full GCs (Contributed by Todd Lipcon)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520667 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8704. add request logging to jetty/httpserver (jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520674 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' into trunk-gd

Conflicts:
	hadoop-project/pom.xml
Revert HADOOP-9877 because of breakage reported in HADOOP-9912



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1520713 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-204-trunk-gd