[Trivial]Fix unncessary "import xx as xx" renaming
This is to fix the unnecessary importing renaming as
"from cinder.api.schemas import default_types as default_types".
@@ -21,7 +21,7 @@ from webob import exc
from cinder.api import microversions as mv
from cinder.api.openstack import wsgi
-from cinder.api.schemas import default_types as default_types
+from cinder.api.schemas import default_types
from cinder.api.v3.views import default_types as default_types_view
from cinder.api import validation
from cinder import db
