HDFS-5857. TestWebHDFS#testNamenodeRestart fails intermittently with NPE. Contributed By Mit Desai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1574683 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5898. Allow NFS gateway to login/relogin from its kerberos keytab. Contributed by Abin Shahab.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1574693 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10211. Enable RPC protocol to negotiate SASL-QOP values between clients and servers. (Contributed by Benoy Antony)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1574697 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10386. Log proxy hostname in various exceptions being thrown in a HA setup. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1574716 13f79535-47bb-0310-9956-ffa450edef68