Fix new pylint errors

Pylint 2.6.0 added two new checkers [1] that make pep8 validation to
fail:

- raise-missing-from (W0707)
- super-with-arguments (R1725)

[1] http://pylint.pycqa.org/en/latest/technical_reference/features.html

Change-Id: I50e798178a546132fba608ec4350d19a24986326

octavia_lib/api/drivers/driver_lib.py

@@ -54,7 +54,7 @@ class DriverLibrary():
         self._check_for_socket_ready(stats_socket)
         self._check_for_socket_ready(get_socket)
 
-        super(DriverLibrary, self).__init__(**kwargs)
+        super().__init__(**kwargs)
 
     def _recv(self, sock):
         size_str = b''
@@ -158,8 +158,8 @@ class DriverLibrary():
                                                 constants.ID: id})
         except driver_exceptions.DriverAgentTimeout:
             raise
-        except Exception:
-            raise driver_exceptions.DriverError()
+        except Exception as e:
+            raise driver_exceptions.DriverError() from e
 
     def get_loadbalancer(self, loadbalancer_id):
         """Get a load balancer object.

octavia_lib/api/drivers/exceptions.py

@@ -38,8 +38,7 @@ class DriverError(Exception):
                                             self.user_fault_string)
         self.operator_fault_string = kwargs.pop('operator_fault_string',
                                                 self.operator_fault_string)
-        super(DriverError, self).__init__(self.user_fault_string,
-                                          *args, **kwargs)
+        super().__init__(self.user_fault_string, *args, **kwargs)
 
 
 class NotImplementedError(Exception):
@@ -60,8 +59,7 @@ class NotImplementedError(Exception):
                                             self.user_fault_string)
         self.operator_fault_string = kwargs.pop('operator_fault_string',
                                                 self.operator_fault_string)
-        super(NotImplementedError, self).__init__(self.user_fault_string,
-                                                  *args, **kwargs)
+        super().__init__(self.user_fault_string, *args, **kwargs)
 
 
 class UnsupportedOptionError(Exception):
@@ -90,8 +88,7 @@ class UnsupportedOptionError(Exception):
                                             self.user_fault_string)
         self.operator_fault_string = kwargs.pop('operator_fault_string',
                                                 self.operator_fault_string)
-        super(UnsupportedOptionError, self).__init__(self.user_fault_string,
-                                                     *args, **kwargs)
+        super().__init__(self.user_fault_string, *args, **kwargs)
 
 
 class UpdateStatusError(Exception):
@@ -119,8 +116,7 @@ class UpdateStatusError(Exception):
         self.status_object_id = kwargs.pop('status_object_id', None)
         self.status_record = kwargs.pop('status_record', None)
 
-        super(UpdateStatusError, self).__init__(self.fault_string,
-                                                *args, **kwargs)
+        super().__init__(self.fault_string, *args, **kwargs)
 
 
 class UpdateStatisticsError(Exception):
@@ -149,8 +145,7 @@ class UpdateStatisticsError(Exception):
         self.stats_object_id = kwargs.pop('stats_object_id', None)
         self.stats_record = kwargs.pop('stats_record', None)
 
-        super(UpdateStatisticsError, self).__init__(self.fault_string,
-                                                    *args, **kwargs)
+        super().__init__(self.fault_string, *args, **kwargs)
 
 
 class DriverAgentNotFound(Exception):
@@ -165,8 +160,7 @@ class DriverAgentNotFound(Exception):
 
     def __init__(self, *args, **kwargs):
         self.fault_string = kwargs.pop('fault_string', self.fault_string)
-        super(DriverAgentNotFound, self).__init__(self.fault_string,
-                                                  *args, **kwargs)
+        super().__init__(self.fault_string, *args, **kwargs)
 
 
 class DriverAgentTimeout(Exception):
@@ -182,8 +176,7 @@ class DriverAgentTimeout(Exception):
 
     def __init__(self, *args, **kwargs):
         self.fault_string = kwargs.pop('fault_string', self.fault_string)
-        super(DriverAgentTimeout, self).__init__(self.fault_string,
-                                                 *args, **kwargs)
+        super().__init__(self.fault_string, *args, **kwargs)
 
 
 class NotFound(Exception):
@@ -209,5 +202,4 @@ class NotFound(Exception):
                                             self.user_fault_string)
         self.operator_fault_string = kwargs.pop('operator_fault_string',
                                                 self.operator_fault_string)
-        super(NotFound, self).__init__(self.user_fault_string,
-                                       *args, **kwargs)
+        super().__init__(self.user_fault_string, *args, **kwargs)

octavia_lib/tests/unit/api/drivers/test_data_models.py

@@ -24,7 +24,7 @@ from octavia_lib.tests.unit import base
 class TestProviderDataModels(base.TestCase):
 
     def setUp(self):
-        super(TestProviderDataModels, self).setUp()
+        super().setUp()
 
         self.loadbalancer_id = uuidutils.generate_uuid()
         self.project_id = uuidutils.generate_uuid()

octavia_lib/tests/unit/api/drivers/test_driver_lib.py

@@ -26,7 +26,7 @@ class TestDriverLib(base.TestCase):
     def setUp(self, mock_check_ready):
         self.driver_lib = driver_lib.DriverLibrary()
 
-        super(TestDriverLib, self).setUp()
+        super().setUp()
 
     @mock.patch('octavia_lib.api.drivers.driver_lib.DriverLibrary.'
                 '_check_for_socket_ready.retry.sleep')

octavia_lib/tests/unit/api/drivers/test_exceptions.py

@@ -19,7 +19,7 @@ from octavia_lib.tests.unit import base
 class TestProviderExceptions(base.TestCase):
 
     def setUp(self):
-        super(TestProviderExceptions, self).setUp()
+        super().setUp()
         self.user_fault_string = 'Bad driver'
         self.operator_fault_string = 'Fix bad driver.'
         self.fault_object = 'MCP'

octavia_lib/tests/unit/api/drivers/test_provider_base.py

@@ -24,7 +24,7 @@ class TestProviderBase(base.TestCase):
     NotImplementedError.
     """
     def setUp(self):
-        super(TestProviderBase, self).setUp()
+        super().setUp()
         self.driver = driver_base.ProviderDriver()
 
     def test_create_vip_port(self):

octavia_lib/tests/unit/base.py

@@ -23,5 +23,5 @@ class TestCase(base.BaseTestCase):
     """Test case base class for all unit tests."""
 
     def setUp(self):
-        super(TestCase, self).setUp()
+        super().setUp()
         self.addCleanup(mock.patch.stopall)