SPARK-5425: Use synchronised methods in system properties to create SparkConf#4221

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jacek-lewandowski wants to merge 3 commits intoapache:branch-1.2from

jacek-lewandowski:SPARK-5425-1.2

Commits on Jan 27, 2015

SPARK-5425: Use synchronised methods in system properties to create SparkConf
jacek-lewandowski
committed

Commits on Jan 29, 2015

SPARK-5425: Use SerializationUtils to save properties in ResetSystemProperties trait
jacek-lewandowski
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Commits on Feb 2, 2015

SPARK-5425: Modified Utils.getSystemProperties to return a map of all system properties - explicit + defaults
jacek-lewandowski
committed