creaet ipv6 network and subnet

neutron-ipv6-network.sh

# Create networks
neutron net-create --shared \
                   --router:external=True \
                   --provider:physical_network vlan \
                   --provider:network_type vlan \
                   --provider:segmentation_id 1100 \
                   "GATEWAY_NET_V6"

neutron subnet-create --dns-nameserver '8.8.8.8' \
                      --dns-nameserver '8.8.4.4' \
                      --name "GATEWAY_SUBNET_V6V4" \
                      "GATEWAY_NET_V6" \
                      '10.51.50.0/16'

neutron subnet-create --ip-version=6 \
                      --ipv6-address-mode=dhcpv6-stateless \
                      --dns-nameserver '2001:4860:4860::8888' \
                      --dns-nameserver '2001:4860:4860::8844' \
                      --name "GATEWAY_SUBNET_V6V6" \
                      "GATEWAY_NET_V6" \
                      '2001:4800:1ae1:18::0/64'