Collect tox logs

Collect the tox logs from the testinfra run on bridge.openstack.org.
The dependent change helps if we have errors installing things into
tox, and this change lets us see the results.

Depends-On: https://review.opendev.org/747325
Change-Id: Id3c39d4287d7dc9705890c73a230b1935d349b9f

playbooks/zuul/run-base-post.yaml

@@ -34,6 +34,13 @@
       set_fact:
         log_dir: "{{ zuul.executor.log_root }}/{{ inventory_hostname }}"
 
+    - name: Collect tox output
+      include_role:
+        name: fetch-tox-output
+      vars:
+        tox_envlist: testinfra
+        zuul_work_dir: src/opendev.org/opendev/system-config
+
       # Because during the test we run ansible as root, we need
       # to allow ourselves permissions to copy the results
     - name: Open ARA results permissions