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/test_floating_ips.py b/stress/test_floating_ips.py
index 302385a..fcc5904 100755
--- a/stress/test_floating_ips.py
+++ b/stress/test_floating_ips.py
@@ -12,16 +12,13 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
-
-# system imports
-import random
-import time
-import telnetlib
 import logging
+import random
+import telnetlib
+import time
 
-# local imports
-import test_case
 import pending_action
+import test_case
 
 
 class TestChangeFloatingIp(test_case.StressTestCase):
@@ -85,7 +82,7 @@
                                   (self.floating_ip.address, self.elapsed()))
                 self.floating_ip.change_pending = False
                 return True
-        except:
+        except Exception:
             if not self.add:
                 self._logger.info('%s removed [%.1f secs elapsed]' %
                                   (self.floating_ip.address, self.elapsed()))