Don't add exception instance in LOG.exception

LOG.exception will print out the full stacktrace, that's enough.
We should only record meaningful message.

merged from I8b5c581717e6b78c11c46e226463927450c9f287

Change-Id: I49865d558ff5feda2d6a803741fbee18064b2aec

ec2api/api/__init__.py

@@ -73,8 +73,8 @@ class FaultWrapper(wsgi.Middleware):
     def __call__(self, req):
         try:
             return req.get_response(self.application)
-        except Exception as ex:
-            LOG.exception(_("FaultWrapper: %s"), unicode(ex))
+        except Exception:
+            LOG.exception(_("FaultWrapper cathes error"))
             return faults.Fault(webob.exc.HTTPInternalServerError())
 
 
@@ -235,8 +235,8 @@ class EC2KeystoneAuth(wsgi.Middleware):
             project_name = result['access']['token']['tenant'].get('name')
             roles = [role['name'] for role
                      in result['access']['user']['roles']]
-        except (AttributeError, KeyError) as e:
-            LOG.exception(_("Keystone failure: %s") % e)
+        except (AttributeError, KeyError):
+            LOG.exception(_("Keystone failure"))
             msg = _("Failure communicating with keystone")
             return faults.ec2_error_response(request_id, "AuthFailure", msg,
                                              status=400)

ec2api/tests/functional/base.py

@@ -347,9 +347,9 @@ class EC2TestCase(base.BaseTestCase):
                                                           **kw_args),
                            str((tb[0], tb[1], tb[2]))))
                 cls.cleanUpItem(function, pos_args, kw_args)
-            except BaseException as exc:
+            except BaseException:
                 fail_count += 1
-                LOG.exception(exc)
+                LOG.exception('Failure in cleanup')
             finally:
                 del trash_bin[key]
         return fail_count

ec2api/tests/functional/scenario/test_ebs_instances.py

@@ -283,8 +283,8 @@ class EC2_EBSInstanceAttaching(base.EC2TestCase):
             try:
                 cls.cleanUpItem(cls.client.DeleteVolume, [],
                                 {'VolumeId': volume_id})
-            except BaseException as exc:
-                LOG.exception(exc)
+            except BaseException:
+                LOG.exception('EBSInstanceAttaching.tearDownClass failure')
 
     def _test_attaching(self, volume_id, device_name, device_prefix,
                         new_device_name_letter):