[SPARK-18646][REPL] Set parent classloader as null for ExecutorClassLoader#17074

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taroplus wants to merge 7 commits intoapache:masterfrom

taroplus:executor_classloader

Commits on Feb 26, 2017

Commits on Mar 3, 2017

Commits on Jun 21, 2017

Add a comment to explain why this class loader does not set parent classloader
taroplus
committed