hnsd should ignore ipv6 addresses if network is not available

[pinheadmz]

I don't have ipv6 on my machine, the query for icann.org wastes so much time on this, that it times out. If I request again, the ipv4 will have been cached (by then) and respond immediately.

ns: query
ns:   id=39901
ns:   labels=0
ns:   name=.
ns:   type=48
ns:   class=1
ns:   edns=1
ns:   dnssec=1
ns:   tld=
ns:   addr=127.0.0.1:20683
ns: sending root soa (39901): 280
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:8f::53 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:8d::53 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:8f::53 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:8f::53 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:89::53 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:1a::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:1b::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:1a::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:1c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:1b::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:1c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:e::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:b::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:b::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:b::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:f::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:b::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:e::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:e::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:b::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:c::1 port 53
[1615899353] libunbound[69307:0] error: udp connect failed: No route to host for 2001:500:e::1 port 53