Swift logs: htmlify logs

Since we're not using the OSLA proxy, we need to pre-render
htmlified versions of logs.

Change-Id: I0dc194960a025bc6df4f8a21763762ea385338e0

playbooks/base-test/post-logs-swift.yaml

@@ -1,6 +1,7 @@
 - hosts: localhost
   roles:
     - role: ara-report
+    - role: htmlify-logs
     - role: upload-logs-swift
       zuul_log_cloud_config: '{{ log_cloud_config }}'
       zuul_log_partition: true