db: Remove unnecessary warning filters

We've resolved these along the way.

Change-Id: Ia08d46948ecd3cee301d39c86c47fab91e8b8fbb
Signed-off-by: Stephen Finucane <[email protected]>

Author: stephenfin

nova/tests/fixtures/nova.py

@@ -835,12 +835,6 @@ def setUp(self):
         # ...but filter everything out until we get around to fixing them
         # TODO(stephenfin): Fix all of these
 
-        warnings.filterwarnings(
-            'ignore',
-            module='nova',
-            message=r'The Engine.execute\(\) method is considered legacy',
-            category=sqla_exc.SADeprecationWarning)
-
         warnings.filterwarnings(
             'ignore',
             module='nova',
@@ -853,12 +847,6 @@ def setUp(self):
             message=r'The Column.copy\(\) method is deprecated .*',
             category=sqla_exc.SADeprecationWarning)
 
-        warnings.filterwarnings(
-            'ignore',
-            module='nova',
-            message=r'The .close\(\) method on a so-called .*',
-            category=sqla_exc.SADeprecationWarning)
-
         warnings.filterwarnings(
             'ignore',
             module='nova',