Fix training-labs publish location

Fix setup to publish to
http://tarballs.openstack.org/training-labs/dist/ and not to
http://tarballs.openstack.org/dist/training-labs/

Change-Id: I6c384fc758fecbd48c5e5b5f1a37c2dee8a75f92

playbooks/training-labs/post.yaml

@@ -3,7 +3,7 @@
 
     - name: Collect generate-labs generated files
       synchronize:
-        dest: "{{ zuul.executor.work_root }}/artifacts"
+        dest: "{{ zuul.executor.work_root }}/artifacts/dist"
         mode: pull
-        src: "src/{{ zuul.project.canonical_name }}/build/dist/"
+        src: "src/{{ zuul.project.canonical_name }}/build/dist"
         verify_host: true

zuul.d/jobs.yaml

@@ -907,8 +907,6 @@
     pre-run: playbooks/training-labs/pre.yaml
     run: playbooks/training-labs/run.yaml
     post-run: playbooks/training-labs/post.yaml
-    vars:
-      fileserver_leading_path: dist
     secrets:
       - secret: site_tarballs
         name: fileserver