[SPARK-3332] Revert spark-ec2 patch that identifies clusters using tags#2225

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JoshRosen wants to merge 2 commits intoapache:branch-1.1from

JoshRosen:revert-ec2-cluster-naming

Commits on Aug 31, 2014

Revert "Spark-3213 Fixes issue with spark-ec2 not detecting slaves created with "Launch More like this""
JoshRosen
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Revert "SPARK-2333 - spark_ec2 script should allow option for existing security group"
JoshRosen
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