Only publish translated guides for master

We currently only handle translations of manuals on master
thus should only publish translated guides there.

The jobs that are publishing translated guides in openstack-manuals are
openstack-install-deploy-guide-ja and openstack-misc-guides-ja. Run them
only on master.

Change-Id: Id20b734aa6465773f2430e7ae5145f90c506370c
Merge "Only publish translated guides for master"