remove pypy jobs
The pypy jobs are non-voting, do not work, and we don't really support
the tool in other libraries. Let's drop the jobs.
- openstack-python35-jobs
- lib-forward-testing
- lib-forward-testing-python3
- - openstack-pypy-jobs-nonvoting
- publish-openstack-docs-pti
- periodic-stable-jobs
- openstack-python36-jobs
