Import openstack-ci/publications into infra.

Fixes bug 1187906.

Initially import openstack-ci/publications from github and add a
post job to publish the contents under docs.openstack.org/infra.

Change-Id: Ia9242dbff2b7f176c92f1e4d535e95e321713e80
Reviewed-on: https://review.openstack.org/31863
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Dan Prince <dprince@redhat.com>
Reviewed-by: Elizabeth Krumbach Joseph <lyz@princessleia.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins