Add support to clear-buffer-cache.py for checking SPARK_HOME for slaves#342

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Commits on Jun 25, 2014

clear-buffer-cache.py assumes the slaves file is located under /root/spark-ec2/slaves . This is not consistent with the Spark setup guide.
rnowling
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Updated previous commit to clear-buffer-cache.py: cleaned up code, changed variable names to camel case for consistency, and prioritized EC2 location to maintain compatibility with original script.
rnowling
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