change kuryr default driver option name
change kuryr default driver option name

kuryr changed driver option to default_driver

Ref: https://review.openstack.org/#/c/508778/

this change updates the template to apply the change.

Change-Id: I38669564a769bbe7b55386db5208a3341b15da9e

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible