svn merge -c 1585538 from trunk for HADOOP-10466. Lower the log level in UserGroupInformation.


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svn merge -c 1585544 Merging from trunk to branch-2 to fix:HDFS-6191. Disable quota checks when replaying edit log. Contributed by Kihwal Lee.

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HDFS-6181. Merging change r1585563 from trunk

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HDFS-6197. Merging change r1585586 from trunk to branch-2.

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HDFS-6180. Merge r1585625 from trunk.

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HDFS-6198. Merging change r1585627 from trunk to branch-2.

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HDFS-6143. Merge r1585639 from trunk.

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