Make gantt unittests non-voting.
Make gantt unittests non-voting.

Turns out there is more work needed than a single change can do - make
the gantt unittests nonvoting while we iterate on tht.

Change-Id: I7ad43886ff67cc2060f668b2a88caf305b9b2c69

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