Improve (IPv6) parsing of "connection resolvers"

which looks here ar an stable hardened 64 bit Gentoo Linux like the following :

tor-relay ~ # ss -nptu  | head -n3
Netid  State      Recv-Q Send-Q Local Address:Port               Peer Address:Port
tcp    ESTAB      0      0      5.9.158.75:443                107.170.93.13:56159               users:(("tor",pid=25056,fd=997))
tcp    ESTAB      0      0      5.9.158.75:443                159.203.97.91:37802               users:(("tor",pid=25056,fd=77))
tor-relay ~ # ss -nptu  | grep '::'
tcp    ESTAB      0      0      2a01:4f8:190:514a::2:443                2001:638:a000:4140::ffff:189:38556               users:(("tor",pid=25056,fd=3175))
tcp    ESTAB      0      0         ::ffff:5.9.158.75:5222                ::ffff:78.54.131.65:34950               users:(("beam",pid=1712,fd=29))
tcp    ESTAB      0      0      2a01:4f8:190:514a::2:443                   2001:858:2:2:aabb:0:563b:1526:51428               users:(("tor",pid=25056,fd=3248))
tcp    ESTAB      0      0         ::ffff:5.9.158.75:5222                ::ffff:78.54.131.65:34882               users:(("beam",pid=1712,fd=26))