Re enable update_router_admin_state scenario test
Re enable update_router_admin_state scenario test

The test is running fine now, let's get it running
again in ovn-slow job which runs in periodic pipeline.

Related-Bug: #1890445
Change-Id: I45e09827e0b998fd3d05d5a8e9cbe24aff9f12e8

mahak/neutron,mahak/neutron,openstack/neutron,openstack/neutron,mahak/neutron,openstack/neutron