[Reportbug-maint] Bug#798745: reportbug: says wrongly that newer release of a package is available

[rpnpif]

Package: reportbug
Version: 6.6.3
Severity: normal

Dear Maintainer,

Reportbug says that the version of the package is out of date but it is not true.

Example :
reportug pk-update-icon

"Getting status for pk-update-icon...
Checking for newer versions at madison...

Your version (2.0.0-1~bpo8+1) of pk-update-icon appears to be out of date.
The following newer release(s) are available in the Debian archive:
  stretch: 2.0.0-1
  unstable: 2.0.0-1"

The 2.0.0-1 release is not newer than 2.0.0-1~bpo8+1.

Regards.

-- Package-specific info:
** {$HOME}/.reportbugrc:
reportbug_version "3.48"
mode standard
ui urwid

-- System Information:
Debian Release: 8.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages reportbug depends on:
ii  apt               1.0.9.8.1
ii  python            2.7.9-1
ii  python-reportbug  6.6.3
pn  python:any        <none>

reportbug recommends no packages.

Versions of packages reportbug suggests:
ii  claws-mail                               3.11.1-3
pn  debconf-utils                            <none>
pn  debsums                                  <none>
pn  dlocate                                  <none>
pn  emacs23-bin-common | emacs24-bin-common  <none>
ii  file                                     1:5.22+15-2
ii  gnupg                                    1.4.18-7
ii  postfix [mail-transport-agent]           2.11.3-1
ii  python-gtk2                              2.24.0-4
pn  python-gtkspell                          <none>
pn  python-urwid                             <none>
ii  python-vte                               1:0.28.2-5
ii  xdg-utils                                1.1.0~rc1+git20111210-7.4

Versions of packages python-reportbug depends on:
ii  apt               1.0.9.8.1
ii  python-debian     0.1.27
ii  python-debianbts  1.12
pn  python:any        <none>

python-reportbug suggests no packages.

-- no debconf information