system-config-roles: only match jobs on roles tested

It seems we have some debugging to do on the openafs roles.  The other
roles here, particularly the bazelisk one, aren't tested here, so
reduce the file matcher.

We can overhaul this more, but it seems like a post-puppet/xenial
thing to do.

Change-Id: I0a41ef48eab0560a23a4e29463435dfe0758d01e

roles-test/post.yaml

@@ -0,0 +1,14 @@
+- hosts: localhost
+  tasks:
+    - name: Make log directories for testing hosts
+      file:
+        path: "{{ zuul.executor.log_root }}/{{ item }}/logs"
+        state: directory
+        recurse: true
+      loop: "{{ query('inventory_hostnames', 'all') }}"
+
+- hosts: all
+  tasks:
+    - include_role:
+        name: stage-output
+

zuul.d/system-config-roles.yaml

@@ -10,8 +10,18 @@
     abstract: true
     parent: base
     run: roles-test/base.yaml
+    post-run: roles-test/post.yaml
     files:
-      - roles/
+      - roles/puppet-install
+      - roles/openafs-client
+      - roles/kerberos-client
+    vars:
+      zuul_copy_output: "{{ copy_output | combine(host_copy_output | default({})) }}"
+      stage_dir: "{{ ansible_user_dir }}/zuul-output"
+      copy_output:
+        '/var/log/syslog': logs_txt
+        '/var/log/messages': logs_txt
+        '/var/log/openafs': logs
 
 - job:
     name: system-config-zuul-role-integration-xenial