Added 'docs' job for manila project
Added 'docs' job for manila project

Set it as nonvotable until all nits are fixed.

Partially implements: blueprint manila-documentation

Change-Id: Id24fe86378c8438298d7561f468bbddd8a862d4e

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