Fix pep8 violations in stress tests

This fixes pep8 failures that occur in the stress tests.
These included 3 types of failures: TEMPEST N301, N306, N201

Change-Id: I54211bea03430de4ad821096eaa5264afc4f22a3
diff --git a/stress/tests/floating_ips.py b/stress/tests/floating_ips.py
index 03bd509..8db06d4 100755
--- a/stress/tests/floating_ips.py
+++ b/stress/tests/floating_ips.py
@@ -13,12 +13,12 @@
 #    limitations under the License.
 """Stress test that associates/disasssociates floating ips"""
 
-# local imports
-from stress.test_floating_ips import TestChangeFloatingIp
 from stress.basher import BasherAction
 from stress.driver import *
+from stress.test_floating_ips import TestChangeFloatingIp
 from tempest import openstack
 
+
 choice_spec = [
     BasherAction(TestChangeFloatingIp(), 100)
 ]