[SPARK-25228][CORE]Add executor CPU time metric.#22218

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LucaCanali wants to merge 7 commits intoapache:masterfrom

LucaCanali:AddExecutrCPUTimeMetric

Commits on Aug 24, 2018

Add Executor CPU Time metric
LucaCanali
committed

Commits on Aug 31, 2018

Add executor CPU Time using ProcessCpuTime method in OperatingSystem MX Bean if available
LucaCanali
committed
Add executor CPU Time using ProcessCpuTime method in OperatingSystem MX Bean, if available
LucaCanali
committed

Commits on Sep 1, 2018

Add executor CPU Time metric (jvmCpuTime) using ProcessCpuTime method in OperatingSystem MX Bean, if available.
LucaCanali
committed
Add executor CPU Time metric (jvmCpuTime) using ProcessCpuTime method in OperatingSystem MX Bean, if available.
LucaCanali
committed
Add executor CPU Time metric (jvmCpuTime) using ProcessCpuTime method in OperatingSystem MX Bean, if available.
LucaCanali
committed

Commits on Sep 3, 2018

removed check for null value.
LucaCanali
committed