[SPARK-11653][Deploy] Allow spark-daemon.sh to run in the foreground#15338

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mikejihbe wants to merge 3 commits intoapache:masterfrom

MustWin:SPARK-11653

Commits on Oct 3, 2016

[SPARK-11653][Deploy] Add a SPARK_NO_DAEMONIZE env var for running foreground operations.
mikejihbe
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Commits on Oct 11, 2016

Updates based on PR feedback: https://github.com/apache/spark/pull/15338#pullrequestreview-3743395. Remove evals and make variables local.
mikejihbe
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Commits on Oct 14, 2016

Re-add quotes to env vars. Add the new SPARK_NO_DAEMONIZE flag to the spark-env.sh.template file
mikejihbe
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