[Reportbug-maint] Bug#848692: reportbug fails with apostrophe in full name

[Yuri DElia]

Package: reportbug
Version: 7.1.1
Severity: normal

This is a regression in 7.1.1:

% DEBFULLNAME="t'est" DEBEMAIL="test at example.com" reportbug reportbug 
*** Welcome to reportbug.  Use ? for help at prompts. ***
Note: bug reports are publicly archived (including the email address of the submitter).
Detected character set: UTF-8
Please change your locale if this is incorrect.

Traceback (most recent call last):
  File "/usr/bin/reportbug", line 2233, in <module>
    main()
  File "/usr/bin/reportbug", line 1107, in main
    return iface.user_interface()
  File "/usr/bin/reportbug", line 1325, in user_interface
    fromaddr = utils.get_user_id(self.options.email, self.options.realname, charset)
  File "/usr/lib/python3/dist-packages/reportbug/utils.py", line 316, in get_user_id
    addr = email.utils.formataddr((realname, email))
AttributeError: 'str' object has no attribute 'utils'

Reportbug fails with both an apostrophe in DEBEMAIL (when formatting as t'est
<test at example.com>) or in the separate DEBFULLNAME variable.

I noticed this as my surname has an apostrophe.

-- Package-specific info:
** Environment settings:
EDITOR="vi"
PAGER="less"
DEBEMAIL="Yuri D'Elia <wavexx at thregr.org>"
NAME="Yuri D'Elia"
INTERFACE="text"

** /home/ydelia/.reportbugrc:
mode expert
ui text
no-debconf
mutt

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (900, 'unstable'), (800, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-rc8-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages reportbug depends on:
ii  apt                1.4~beta2
ii  python3-reportbug  7.1.1
pn  python3:any        <none>

reportbug recommends no packages.

Versions of packages reportbug suggests:
pn  claws-mail                                 <none>
ii  debconf-utils                              1.5.59
ii  debsums                                    2.1.3
pn  dlocate                                    <none>
pn  emacs23-bin-common | emacs24-bin-common    <none>
ii  exim4-daemon-light [mail-transport-agent]  4.88~RC6-1
ii  file                                       1:5.29-2
ii  gir1.2-gtk-3.0                             3.22.5-1
pn  gir1.2-vte-2.91                            <none>
ii  gnupg                                      2.1.16-3
ii  python3-gi                                 3.22.0-2
pn  python3-gtkspellcheck                      <none>
ii  python3-urwid                              1.3.1-2+b1
ii  xdg-utils                                  1.1.1-1