[Reportbug-maint] Bug#884783: reportbug fails with IPv6 address literals

[Rémi Denis-Courmont]

Package: reportbug
Version: 7.1.7
Severity: normal
Tags: ipv6

Dear Maintainer,

reportbug appears unable to handle IPv6 address in --smtphost.

# reportbug $PACKAGE --smtphost [::1]:10025
fails with temporary resolution error -3.

-- Package-specific info:
** Environment settings:
VISUAL="vim"
INTERFACE="text"

** /home/remi/.reportbugrc:
reportbug_version "6.4.4"
mode standard
ui text
email "courmisch at gmail.com"
smtphost "ip6-localhost:10025"

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.12.14-basile (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to fi_FI.UTF-8), LANGUAGE=fr_FR:fr (charmap=UTF-8) (ignored: LC_ALL set to fi_FI.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages reportbug depends on:
ii  apt                1.6~alpha5
ii  python3            3.6.4~rc1-2
ii  python3-reportbug  7.1.7

reportbug recommends no packages.

Versions of packages reportbug suggests:
pn  claws-mail                               <none>
pn  debconf-utils                            <none>
pn  debsums                                  <none>
pn  dlocate                                  <none>
pn  emacs24-bin-common | emacs25-bin-common  <none>
ii  file                                     1:5.32-1
ii  gir1.2-gtk-3.0                           3.22.26-2
pn  gir1.2-vte-2.91                          <none>
ii  gnupg                                    2.2.3-1
pn  postfix | exim4 | mail-transport-agent   <none>
ii  python3-gi                               3.26.1-2
pn  python3-gi-cairo                         <none>
pn  python3-gtkspellcheck                    <none>
pn  python3-urwid                            <none>
ii  xdg-utils                                1.1.2-1

Versions of packages python3-reportbug depends on:
ii  apt                1.6~alpha5
ii  file               1:5.32-1
ii  python3            3.6.4~rc1-2
ii  python3-debian     0.1.31
ii  python3-debianbts  2.7.1
ii  python3-requests   2.18.1-1

python3-reportbug suggests no packages.

-- no debconf information