Allow stage-output to copy root-owned files

This makes it easier to tell stage-output to copy files such
as syslog from remote nodes.

Change-Id: Ica2397a50de1054f5d5ec81b54ab36fda9bdc333

roles/stage-output/tasks/main.yaml

@@ -59,8 +59,16 @@
   # remote_src copy does not work recursively, synchronise is restricted by
   # zuul, using command
   command: cp -pRL {{ item.source}} {{ stage_dir }}/{{ item.dest }}
+  become: true
   with_items: "{{ all_sources }}"
 
+- name: Make all log files readable
+  file:
+    dest: "{{ stage_dir }}/logs"
+    mode: u=rwX,g=rX,o=rX
+    recurse: yes
+  become: yes
+
 - name: Discover log files that match extension_list
   find:
     paths: "{{ stage_dir }}/logs"