fixes as per review: removed printing of group_id and added comment

Author: Vladimir Grigor

ec2/spark_ec2.py

@@ -1082,11 +1082,12 @@ def real_main():
                     time.sleep(30)  # Yes, it does have to be this long :-(
                     for group in groups:
                         try:
+                            # It is needed to use group_id to make it work with VPC
                             conn.delete_security_group(group_id=group.id)
-                            print "Deleted security group %s, id %s" % (group.name, group.id)
+                            print "Deleted security group %s" % group.name
                         except boto.exception.EC2ResponseError:
                             success = False
-                            print "Failed to delete security group %s, id %s" % (group.name, group.id)
+                            print "Failed to delete security group %s" % group.name
 
                     # Unfortunately, group.revoke() returns True even if a rule was not
                     # deleted, so this needs to be rerun if something fails