mypy: work around mypy bug #13214
mypy: work around mypy bug #13214

Turn off in-project stubs for now until this bug
is fixed and in a mypy release we can consume.

https://github.com/python/mypy/issues/13214

Change-Id: I079802bea4ae86ed29c57bd5273ef8e0e4bb6b3c

openstack/cinder,mahak/cinder,mahak/cinder,openstack/cinder