Use sudo when collecting podman logs in openstack-functional test

We run the podman containers as root, so when we collect the logs,
we must do that as root too, otherwise we won't see the containers.
This is why we currently collect no container logs.

Also, increase the boot timeout from 600 to 1200 seconds to deal
with what appears to be much slower boot times of the test node.

Change-Id: Ie146599f7598459c41c2d2d885b90a702bc900bb

playbooks/nodepool-functional-container-openstack/post.yaml

@@ -3,6 +3,8 @@
     - name: Collect container logs
       include_role:
         name: collect-container-logs
+        apply:
+          become: yes
       vars:
         container_command: podman
     - name: Copy nodepool logs

playbooks/nodepool-functional-container-openstack/templates/nodepool.yaml.j2

@@ -19,8 +19,8 @@ providers:
     region-name: RegionOne
     cloud: devstack
     # Long boot timeout to deal with potentially nested virt.
-    boot-timeout: 600
-    launch-timeout: 900
+    boot-timeout: 1200
+    launch-timeout: 1500
     rate: 0.25
     diskimages:
       - name: test-image