HADOOP-9872. Improve protoc version handling and detection. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514068 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9652.  RawLocalFs#getFileLinkStatus does not fill in the link owner and mode.  (Andrew Wang via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514088 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9381. Document dfs cp -f option. Contributed by Keegan Witt and Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514089 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4816. transitionToActive blocks if the SBN is doing checkpoint image transfer. (Andrew Wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514095 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5051. nn fails to download checkpointed image from snn in some setups. Contributed by Vinay and Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514110 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5068. Convert NNThroughputBenchmark to a Tool to allow generic options. Contributed by Konstantin Shvachko.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514114 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5079. Cleaning up NNHAStatusHeartbeat.State from DatanodeProtocolProtos. Contributed by Tao Luo.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514118 13f79535-47bb-0310-9956-ffa450edef68
YARN-1056. Remove dual use of string 'resourcemanager' in yarn.resourcemanager.connect.{max.wait.secs|retry_interval.secs}. Contributed by Karthik Kambatla.

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