add test-release-openstack-python3 to publish-to-pypi-python3
add test-release-openstack-python3 to publish-to-pypi-python3

Add a check job to test the packaging and metadata for projects.

Depends-On: https://review.openstack.org/#/c/574842/
Change-Id: I347bf4fdbf53dfcd1fcf887341809057afa2a1ea
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs