Ends project gating for doc8
Remove doc8 from the gate as the project has been migrated to PyCQA [1].
[1]
- project:
name: x/doc8
templates:
- - openstack-python-jobs
- - openstack-python35-jobs
- - publish-to-pypi
+ - noop-jobs
- project:
name: x/docker-machine-openstack
