Improve storyboard gate jobs
Improve storyboard gate jobs

* add py27 job that'll run django-powered unit tests;
* add py26 job to experimental pipeline to track py26 support that is
  now broken by OrderedDict usage.

Change-Id: Ibfe8aa2ce575942b3a9cac8e74bf3572b60172ac

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