[SPARK-22805][CORE] Use StorageLevel aliases in event logs#19992

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superbobry wants to merge 9 commits intoapache:masterfrom

criteo-forks:compact-storage-level

Commits on Dec 15, 2017

[SPARK-22805][CORE] Use StorageLevel aliases in event logs
Sergei Lebedev
committed
Addressed review comments
Sergei Lebedev
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Commits on Dec 16, 2017

Added StorageLevel.PREDEFINED to reduce boilerplate in name/fromString
Sergei Lebedev
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Fixed ScalaDoc
Sergei Lebedev
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Commits on Dec 17, 2017

Fixed a typo in a comment
Sergei Lebedev
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Commits on Dec 19, 2017

Added braces to StorageLevel.{name,fromString}
Sergei Lebedev
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Commits on Dec 20, 2017

More braces
Sergei Lebedev
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Commits on Dec 26, 2017

Addressed more review comments
Sergei Lebedev
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Commits on Jan 1, 2018

Added a test explicitly ensuring backward compatbility of StorageLevel
Sergei Lebedev
committed