[SPARK-4595][Core] Fix MetricsServlet not work issue#3444

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jerryshao wants to merge 3 commits intoapache:masterfrom jerryshao:SPARK-4595

+28-11

Commits on Nov 25, 2014

Fix MetricsServlet not work issue
jerryshao
committed

Commits on Dec 16, 2014

Guard against misuse of MetricsSystem methods.
JoshRosen
committed

Commits on Dec 17, 2014

Merge pull request #10 from JoshRosen/metrics-system-cleanup
jerryshao
committed