Adding Shark 0.7.1 to EC2 scripts

ec2/spark_ec2.py

@@ -155,7 +155,7 @@ def is_active(instance):
 
 # Return correct versions of Spark and Shark, given the supplied Spark version
 def get_spark_shark_version(opts):
-  spark_shark_map = {"0.7.3": "0.7.0", "0.8.0": "0.8.0"}
+  spark_shark_map = {"0.7.3": "0.7.1", "0.8.0": "0.8.0"}
   version = opts.spark_version.replace("v", "")
   if version not in spark_shark_map:
     print >> stderr, "Don't know about Spark version: %s" % version