[SPARK-19179][YARN] Change spark.yarn.access.namenodes config and update docs #16560
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What changes were proposed in this pull request?
spark.yarn.access.namenodesconfiguration cannot actually reflects the usage of it, inside the code it is the Hadoop filesystems we get tokens, not NNs. So here propose to update the name of this configuration, also change the related code and doc.How was this patch tested?
Local verification.