dhcpv6_relays for ipv6 dhcpv6 relays in vxlans vlan tree

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Is your feature request related to a problem? Please describe. We CNAAS-NMS has an option for configuring dhcp_relays. because (for example) Juniper has a different config tree for dhcpv6 we have to 'detect' in Jinja if a dhcp relay is ipv4 or ipv6. This makes the jinja2 templates hacky and ugly.

Describe the solution you'd like Thats why It would be prettier tot just include an option dhcpv6_relays as a list of ipv6 addresses

Describe alternatives you've considered The alternative is to solve it in jinja2 templates. But that can become hacky and cumbersome....at least for a Juniper

Additional context None