Remove deprecated nova::use_ipv6
Remove deprecated nova::use_ipv6

This param is deprecated and will be removed in [1].

[1] https://review.opendev.org/#/c/658403/

Change-Id: I709f2555e2f5ef01cce0dacb373d56ddd0744a99

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration