Add spacing to implicit string concatenation for python backwards compatibility

bin/cluster

@@ -18,10 +18,10 @@ class Cluster(object):
         if 'ANSIBLE_SSH_ARGS' not in os.environ:
             os.environ['ANSIBLE_SSH_ARGS'] = (
                 '-o ForwardAgent=yes'
-                '-o StrictHostKeyChecking=no'
-                '-o UserKnownHostsFile=/dev/null'
-                '-o ControlMaster=auto'
-                '-o ControlPersist=600s'
+                ' -o StrictHostKeyChecking=no'
+                ' -o UserKnownHostsFile=/dev/null'
+                ' -o ControlMaster=auto'
+                ' -o ControlPersist=600s'
             )
 
     def apply(self):