[SPARK-4204][Core][WebUI] Change Utils.exceptionString to contain the inner exceptions and make the error information in Web UI more friendly#3073

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zsxwing wants to merge 6 commits intoapache:masterfrom

zsxwing:SPARK-4204

Commits on Nov 3, 2014

Change Utils.exceptionString to contain the inner exceptions and make the error information in Web UI more friendly
zsxwing
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Commits on Nov 4, 2014

Update as per review and increase the max height of the stack trace details
zsxwing
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Commits on Nov 5, 2014

Backward compatibility for old history server
zsxwing
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Commits on Nov 6, 2014

Commits on Nov 7, 2014

Add comments to explain the stack trace difference
zsxwing
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