Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

blacklist:
 W504 line break after binary operator

Fix:
E305 expected 2 blank lines after class or function definition, found 1

Change-Id: I56d62f67914f07e7aef74f857c4b42e3bfd3416e

4 files changed, 4 insertions, 0 deletions

diff --git a/oslo_db/sqlalchemy/enginefacade.py b/oslo_db/sqlalchemy/enginefacade.py
index b56883f..6a13c70 100644
--- a/oslo_db/sqlalchemy/enginefacade.py
+++ b/oslo_db/sqlalchemy/enginefacade.py
@@ -1076,6 +1076,7 @@ class _TransactionContextManager(object):
 def async_compat(self):
     return self.async_
 
+
 setattr(
     _TransactionContextManager,
     "async", async_compat
diff --git a/oslo_db/sqlalchemy/exc_filters.py b/oslo_db/sqlalchemy/exc_filters.py
index 2d9b162..b4325a5 100644
--- a/oslo_db/sqlalchemy/exc_filters.py
+++ b/oslo_db/sqlalchemy/exc_filters.py
@@ -427,6 +427,7 @@ def _raise_for_all_others(error, match, engine_name, is_disconnect):
     LOG.warn('DB exception wrapped.', exc_info=True)
     raise exception.DBError(error)
 
+
 ROLLBACK_CAUSE_KEY = 'oslo.db.sp_rollback_cause'
 
 
diff --git a/oslo_db/sqlalchemy/utils.py b/oslo_db/sqlalchemy/utils.py
index b7e101e..d1499f0 100644
--- a/oslo_db/sqlalchemy/utils.py
+++ b/oslo_db/sqlalchemy/utils.py
@@ -1026,6 +1026,7 @@ class DialectMultiFunctionDispatcher(DialectFunctionDispatcher):
                     "Return value not allowed for "
                     "multiple filtered function")
 
+
 dispatch_for_dialect = DialectFunctionDispatcher.dispatch_for_dialect
 
 
diff --git a/oslo_db/tests/sqlalchemy/base.py b/oslo_db/tests/sqlalchemy/base.py
index e07b45c..9d8cf35 100644
--- a/oslo_db/tests/sqlalchemy/base.py
+++ b/oslo_db/tests/sqlalchemy/base.py
@@ -25,6 +25,7 @@ from oslotest import base as test_base
 class Context(object):
     pass
 
+
 context = Context()