Tests: Add alembic to pylint ignores
Add alembic.context and alembic.op to pylint ignore
list.  These are dynamic modules that pylint can't
process, generating many false positive pylint errors.
@@ -221,7 +221,7 @@ additional-builtins=_
[TYPECHECK]
# List of module names for which member attributes should not be checked
-ignored-modules=six.moves,_MovedItems
+ignored-modules=six.moves,_MovedItems,alembic.context,alembic.op
signature-mutators=unittest.mock.patch,unittest.mock.patch.object,sqlalchemy.util._preloaded.dependencies
# This is for cinder.objects.*, and requests.packages.*, but due to
