Add "neutron-tempest-plugin-jobs" to CI
Add "neutron-tempest-plugin-jobs" to CI

This template adds the following jobs to the CI:
- neutron-tempest-plugin-api
- neutron-tempest-plugin-scenario-linuxbridge
- neutron-tempest-plugin-scenario-openvswitch
- neutron-tempest-plugin-scenario-openvswitch-iptables_hybrid
- neutron-tempest-plugin-scenario-ovn
- neutron-tempest-plugin-designate-scenario

The aim of this patch is to improve the CI testing
without manually calling these jobs.

Change-Id: I30886d313ea14d36f44e0ab2278cb2b751ca4d19

openstack/neutron-lib,openstack/neutron-lib,openstack/neutron-lib,openstack/neutron-lib