[SPARK-20608] allow standby namenodes in spark.yarn.access.namenodes#17872

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charliechen211 wants to merge 3 commits intoapache:masterfrom

charliechen211:SPARK-20608-master

Commits on May 5, 2017

[SPARK-20608] allow standby namenodes in spark.yarn.access.namenodes
Chen Yuechen
committed

Commits on May 8, 2017

[SPARK-20608] refactor exception logs for failure of fetching token from standby namenodes
Chen Yuechen
committed
[SPARK-20608] merge imports from the same package
Chen Yuechen
committed