Merge "switch documentation job to new PTI"

.zuul.yaml

@@ -360,11 +360,11 @@
       - openstack-python-jobs
       - openstack-python35-jobs
       - check-requirements
-      - publish-openstack-sphinx-docs
-      - release-notes-jobs
+      - publish-openstack-docs-pti
+      - release-notes-jobs-python3
     check:
       jobs:
-        - build-openstack-sphinx-docs:
+        - openstack-tox-docs:
             vars:
               sphinx_python: python3
         - openstacksdk-ansible-devel-functional-devstack:
@@ -386,7 +386,7 @@
         - bifrost-integration-tinyipa-ubuntu-xenial
     gate:
       jobs:
-        - build-openstack-sphinx-docs:
+        - openstack-tox-docs:
             vars:
               sphinx_python: python3
         - openstacksdk-functional-devstack