[SPARK-26604][CORE][BACKPORT-2.4] Clean up channel registration for StreamManager#24013

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abellina wants to merge 2 commits intoapache:branch-2.4from

abellina:SPARK-26604_cherry_pick_2_4

Commits on Mar 7, 2019

[SPARK-26604][CORE] Clean up channel registration for StreamManager

viirya
authored and
Alessandro Bellina
committed
[SPARK-26604][CORE][BACKPORT-2.4] remove channel registration in TransportRequestHandler
Alessandro Bellina
committed