Add swift details to experimental-swift-logs.*

Zuul must be explicitly told in its layout file which jobs should have
swift parameters passed in. Start with experimental-swift-logs.* passing
in the swift creds name as 'logs'. This matches up with the existing
config-pep8 jobs we have in the experimental queue which is being used
for testing.

Change-Id: I4816befb67bd3c793a72b8fcd403366cb9a523d4

modules/openstack_project/files/zuul/layout.yaml

@@ -653,6 +653,10 @@ jobs:
     voting: false
   - name: gate-pecan-tox-barbican-tip
     voting: false
+  # Swift log publishing details
+  - name: ^experimental-swift-logs.*$
+    swift:
+      - name: logs
 
 # The project list is grouped by type of project, and within each
 # group, projects are sorted (mostly) alphabetically.