Add radvd to neutron containers
Add radvd to neutron containers

The radvd daemon supports additional IPv6 features that
dnsmasq does not, such as unicast router announcements. This patch
installs radvd within the neutron containers.

Closes-Bug: 1492080

Change-Id: Ia3ff88c19e878015331af9446eca6393c85e1ca9

michaelgugino/openstack-ansible-os_neutron,michaelgugino/openstack-ansible-os_neutron