template: Add relay-v6.tmpl
Let relay.tmpl be IPv4 only else we are forced to pass "ipv6_addr=" to all templates. Without it, all IPv6 ORPorts end up with "None".
Instead, when we explicitly want a network with IPv6 support, use relay-v6.tmpl which sets the IPv6 ORPort properly.
Fixese #40008 (closed)
Signed-off-by: David Goulet dgoulet@torproject.org