Add zuul template for rtfd jobs
Add zuul template for rtfd jobs

Use a template in layout.yaml instead of repeating
different rules for poking rtfd when docs need to be
rebuilt.

Change-Id: Ibf18d96610ed0a17a6a35be58422b1c5f4e9b00b

open-switch/infra_project-config,citrix-openstack/project-config,noorul/os-project-config,open-switch/infra_project-config,Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config,openstack-infra/project-config,osrg/project-config,coolsvap/project-config,Tesora/tesora-project-config,coolsvap/project-config,anbangr/osci-project-config,citrix-openstack/project-config,dongwenjuan/project-config,osrg/project-config,anbangr/osci-project-config,noorul/os-project-config