Do not use old (v1) network_data.yaml for OSP17 ipv6 deployments
Do not use old (v1) network_data.yaml for OSP17 ipv6 deployments

OSP17 migrated to network v2 format, which makes
-n /home/stack/virt/network/network_data.yaml
obsolete and also breaking the deployment currently, as it prompts
for the confirmation during start.

From now on only the network_data_v2.yaml file should be included
- which already is - though it did not propagate into ipv6 flow because
of the "use_network_data" bool, controlling it, not being
switched properly.

use_network_data could be refactored globally instead of locally,
but it seems to be problematic since that var also controls
template generation and flow in various places.

Change-Id: I55839b196ff2b874f201354b56735a9bc3546b5c

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared