Update gate-zuul-nodepool
Update gate-zuul-nodepool

This runs the integration tests using the tox macro.  It renames
the test script to a setup script since we no longer expect it to
actually run the tests.

It also collects and publishes the nodepool logs.

Change-Id: I12143ac0841e5fc646448eae4171594579fa0086

openstack-infra/project-config,openstack-infra/project-config