[SPARK-9844][CORE] File appender race condition during shutdown#10714

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BryanCutler wants to merge 7 commits intoapache:masterfrom

BryanCutler:file-appender-read-ioexception-SPARK-9844

Commits on Jan 12, 2016

[SPARK-9844] Added check in FileAppender to not thrown an IOException if marked as stopped and changed file operation block to use tryWithSafeFinally
BryanCutler
committed
[SPARK-9844] Added unit test for closing FileAppender InputStream asynchronously
BryanCutler
committed
fixed import order
BryanCutler
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Did not need check for log level ERROR because only logging ERRORS, check for getThrowableInformation null
BryanCutler
committed
fixed import order
BryanCutler
committed
Cleaned up exception handling and fixed check for appending for only if positive bytes are read
BryanCutler
committed
Can use a placeholder for exception match since it is being ignored
BryanCutler
committed