remove repeat var define in nova/defaults/main.yml
remove repeat var define in nova/defaults/main.yml

Change-Id: I340209c686e57f26d2e9caf9011bfdd360ae83ad
(cherry picked from commit 7fba7b3c9c75e46dfee66cfa72a784c216a87d6d)

yanyao/openstack-deployment,yanyao/openstack-deployment,yanyao/openstack-deployment,yanyao/openstack-deployment