Revert "Revert "Add conditional skips for nova jobs""
Revert "Revert "Add conditional skips for nova jobs""

Restores 1b5429fbccca64eddeed58c12b71c131da5751f2 which was reverted due
to bug 2000166, which has been fixed in
I99dc3a58c63946ddb54849b1629101b062159a69

This reverts commit 33951b04b2d57d14c75f8c6b7041c2366408c4d7.

Change-Id: I0a5542fb080eae99902b3a771a751171b1698106

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