[SPARK-13152][CORE] Fix task metrics deprecation warning#11056

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holdenk wants to merge 2 commits intoapache:masterfrom

holdenk:SPARK-13152-fix-task-metrics-deprecation-warnings

Commits on Feb 3, 2016

Make an internal non-deprecated version of incBytesRead and incRecordsRead so we don't have unecessary deprecation warnings in our build.
holdenk
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Add note about reason for doing this (CR feedback from Andrew Or)
holdenk
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