Add early failure detection in devstack-tempest-ipv6

Early failure detection was added in devstack-tempest job
in https://review.opendev.org/c/openstack/tempest/+/924956
but missed to add ipv6 base job.

Change-Id: I3970ac7d68248b9720a9062e2ebc7915035e52a1

zuul.d/base.yaml

@@ -64,6 +64,10 @@
     required-projects: *base_required-projects
     timeout: 7200
     roles: *base_roles
+    failure-output:
+      # This matches stestr/tempest output when a test fails
+      # {1} tempest.api.test_blah [5.743446s] ... FAILED
+      - '\{\d+\} (.*?) \[[\d\.]+s\] \.\.\. FAILED'
     vars: *base_vars
     run: playbooks/devstack-tempest-ipv6.yaml
     post-run: playbooks/post-tempest.yaml