fix E122 and E126 flake8 issues

Simple indenting for clarity. E122 and E126 are generally pretty
reasonable and not pathologic, so make these cleanups so we can
start enforcing them.

Part of violetprint:travel-day-cleanups

Change-Id: Ie1ff8d31aab83b943784a34702cc5668add68a21
diff --git a/stress/driver.py b/stress/driver.py
index f80e765..9604318 100644
--- a/stress/driver.py
+++ b/stress/driver.py
@@ -261,7 +261,7 @@
         state.delete_instance_state(kill_id)
     for floating_ip_state in state.get_floating_ips():
         manager.floating_ips_client.delete_floating_ip(
-                                            floating_ip_state.resource_id)
+            floating_ip_state.resource_id)
     for keypair_state in state.get_keypairs():
         manager.keypairs_client.delete_keypair(keypair_state.name)
     for volume_state in state.get_volumes():