Add gate jobs for oslo libraries
Add gate jobs for oslo libraries

Create templates for python3, pypy, and tempest gating jobs and apply
them to cliff, pycadf, stevedore, taskflow, oslo.test, and oslo.vmware.

Change-Id: I6373953fe049e92865972115957ff9e44a7001a0

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