[SPARK-1192][RESUBMIT]Missing document of some parameters in Spark Core

[CodingCat]

It's a resubmission of #85 according to @mateiz 's suggestion

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Hi, @mateiz and @pwendell

I found that nearly all parameters in constructing actor system (AkkaUtil) are not documented...

IIRC, there was a PR which proposes that we should leave space for the user to configure the Akka system, is that still valid?

[CodingCat]

ignore the first 6 parameters...they are duplicate with the ones in spark-standalone.md...

[SparkQA]

QA tests have started for PR 2312 at commit 9f4e2cd.

• This patch merges cleanly.

[SparkQA]

QA tests have finished for PR 2312 at commit 9f4e2cd.

• This patch fails unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

QA tests have started for PR 2312 at commit 1784b47.

• This patch merges cleanly.

[SparkQA]

QA tests have finished for PR 2312 at commit 1784b47.

• This patch fails unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[nchammas]

@CodingCat This PR has gone stale. Do you want to update it?

[CodingCat]

@nchammas this has been a long process (since my first submit in #85) , since most of the parameters are not frequently involved in the daily usage, I will close this one

Maybe we can update the doc for those missing parameters once we find some of them are useful

[nchammas]

Okie doke. Sounds good to me.