Backport [SPARK-5847] Allow for configuring MetricsSystem's prefix#15023

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AnthonyTruchet wants to merge 1 commit intoapache:branch-1.6from

criteo-forks:backport-SPARK-5847

Commits on Sep 9, 2016

[SPARK-5847][CORE][BRANCH-1.6] Allow for configuring MetricsSystem's use of app ID to namespace all metrics
Anthony Truchet
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