PEP8 fixes

ec2/spark_ec2.py

@@ -200,6 +200,7 @@ def get_spark_shark_version(opts):
         sys.exit(1)
     return (version, spark_shark_map[version])
 
+
 # Attempt to resolve an appropriate AMI given the architecture and
 # region of the request.
 def get_spark_ami(opts):
@@ -421,11 +422,11 @@ def launch_cluster(conn, opts, cluster_name):
     # Give the instances descriptive names
     for master in master_nodes:
         master.add_tag(
-            key='Name', 
+            key='Name',
             value='spark-{cn}-master-{iid}'.format(cn=cluster_name, iid=master.id))
     for slave in slave_nodes:
         slave.add_tag(
-            key='Name', 
+            key='Name',
             value='spark-{cn}-slave-{iid}'.format(cn=cluster_name, iid=slave.id))
 
     # Return all the instances