HADOOP-9355.  Abstract symlink tests to use either FileContext or FileSystem. (all files) (Andrew Wang via Colin Patrick McCabe)

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merge r1512026: HADOOP-9833 move slf4j to version 1.7.5

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svn merge -c 1512057 merging from trunk to branch-2.1-beta to fix HDFS-5047. Supress logging of full stack trace of quota and lease exceptions.

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Merge -c 1512081 from trunk to branch-2.1-beta to fix YARN-1043. Push all metrics consistently. Contributed by Jian He.

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