[SPARK-15917][CORE] Added support for number of executors in Standalone [WIP]#15405

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JonathanTaws wants to merge 5 commits intoapache:masterfrom

JonathanTaws:SPARK-15917

Commits on Jun 24, 2016

[SPARK-15917] Added support for number of executors for Standalone mode
JonathanTaws
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Commits on Oct 4, 2016

[SPARK-15917] Added warning message if requested number of executors can't be satisfied
JonathanTaws
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Commits on Oct 9, 2016

Added check on number of workers to avoid displaying the same message multiple times
JonathanTaws
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Improved check on num executors warning message
JonathanTaws
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Commits on Oct 10, 2016

Corrected style mistake on if statement
JonathanTaws
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