Move extensions_to_txt to the job defintion

Move extensions_to_txt to the job defintion so that it may be
extended by descendant jobs.

Depends-on: https://review.openstack.org/540485/

Change-Id: I6e9009faa1451698ed781ce1ffdd9f22c97daa93

.zuul.yaml

@@ -111,6 +111,12 @@
         '/etc/glusterfs/glusterd.vol': 'logs'
         '/etc/resolv.conf': 'logs'
         '/var/log/unbound.log': 'logs'
+      extensions_to_txt:
+        conf: True
+        log: True
+        localrc: True
+        stackenv: True
+        summary: True
     pre-run: playbooks/pre.yaml
     run: playbooks/devstack.yaml
     post-run: playbooks/post.yaml

playbooks/post.yaml

@@ -24,12 +24,6 @@
     # capture-system-logs should be the last role before stage-output
     - capture-system-logs
     - role: stage-output
-      extensions_to_txt:
-        - conf
-        - log
-        - localrc
-        - stackenv
-        - summary
     # NOTE(andreaf) We need fetch-devstack-log-dir only as long as the base job
     # starts pulling logs for us from {{ ansible_user_dir }}/logs.
     # Meanwhile we already store things in ansible_user_dir and use