Run the additional-pkg-repos devstack-plugin as self-test
Run the additional-pkg-repos devstack-plugin as self-test

Add gate-tempest-dsvm-nova-libvirt-kvm-apr to it's own check pipepline.

This is non-voting to start with while we work though issues with the
plugin.

Once it's passing again, we'll make it voting and add it to the gate
pipeline.

Change-Id: I96b11893fe0079b7e02b730449c9c3e03f19b762

Tesora/tesora-project-config,openstack-infra/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config