pep8 fix

ec2/spark_ec2.py

@@ -731,7 +731,7 @@ def get_num_disks(instance_type):
 # cluster (e.g. lists of masters and slaves). Files are only deployed to
 # the first master instance in the cluster, and we expect the setup
 # script to be run on that instance to copy them to other nodes.
-# 
+#
 # root_dir should be an absolute path to the directory with the files we want to deploy.
 def deploy_files(conn, root_dir, opts, master_nodes, slave_nodes, modules):
     active_master = master_nodes[0].public_dns_name