Update nodepool launchers to focal in testing

We are beginning the process to start updating these servers from xenial
to focal. Update the system-config-run-nodepool test platform to reflect
this. We can land this once the production servers have been updated but
until then this should give us an idea if things are working properly.

Depends-On: https://review.opendev.org/c/openstack/project-config/+/776979
Change-Id: Id6b32a950b69ed15fb1ce54c880b66b379b02fdf

testinfra/test_nodepool.py

@@ -14,7 +14,7 @@
 
 import pytest
 
-testinfra_hosts = ['nl01.openstack.org', 'nb01.opendev.org']
+testinfra_hosts = ['nl01.opendev.org', 'nb01.opendev.org']
 
 
 def test_clouds_yaml(host):
@@ -33,7 +33,7 @@ def test_kube_config(host):
     assert b'nodepool_k8s_key' in kubeconfig.content
 
 def test_launcher_container_running(host):
-    if host.backend.get_hostname() != 'nl01.openstack.org':
+    if host.backend.get_hostname() != 'nl01.opendev.org':
         pytest.skip()
 
     cmd = host.run("docker ps -a --format '{{ .Names }}'")

zuul.d/system-config-run.yaml

@@ -231,8 +231,8 @@
           label: ubuntu-bionic
         - name: zk01.opendev.org
           label: ubuntu-bionic
-        - name: nl01.openstack.org
-          label: ubuntu-xenial
+        - name: nl01.opendev.org
+          label: ubuntu-focal
         - name: nb01.opendev.org
           label: ubuntu-bionic
     required-projects:
@@ -240,7 +240,7 @@
       - opendev/system-config
       - openstack/project-config
     host-vars:
-      nl01.openstack.org:
+      nl01.opendev.org:
         host_copy_output:
           '/etc/nodepool/nodepool.yaml': logs
           '/var/log/nodepool/launcher-debug.log': logs