Bug#909239: lintian: ancient-python-version-field is wrong

[Julian Andres Klode <jak@debian.org>]

Package: lintian
Version: 2.5.101
Severity: normal

lintian reports ancient-python-version-field for python-apt, but removing that
causes py{,3}versions to complain:

pyversions: missing X(S)-Python-Version in control file, fall back to debian/pyversions
pyversions: missing debian/pyversions file, fall back to supported versions
py3versions: no X-Python3-Version in control file, using supported versions

hence the autopkgtests fail because of stderr, so it is not possible to remove
those fields as lintian suggests.

Lintian should not tell us to remove fields that then cause warnings in build
tools. Or those tools should be fixed.

-- System Information:
Debian Release: buster/sid
  APT prefers cosmic
  APT policy: (500, 'cosmic'), (100, 'cosmic-proposed')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.0-7-generic (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages lintian depends on:
ii  binutils                       2.31.1-5ubuntu1
ii  bzip2                          1.0.6-9
ii  diffstat                       1.61-1build1
ii  dpkg                           1.19.0.5ubuntu5
ii  file                           1:5.34-2
ii  gettext                        0.19.8.1-7
ii  intltool-debian                0.35.0+20060710.4
ii  libapt-pkg-perl                0.1.34
ii  libarchive-zip-perl            1.63-1
ii  libcgi-pm-perl                 4.40-1
ii  libclass-accessor-perl         0.51-1
ii  libclone-perl                  0.39-1
ii  libdpkg-perl                   1.19.0.5ubuntu5
ii  libemail-valid-perl            1.202-1
ii  libfile-basedir-perl           0.08-1
ii  libipc-run-perl                20180523.0-1
ii  liblist-moreutils-perl         0.416-1build3
ii  libparse-debianchangelog-perl  1.2.0-12
ii  libtext-levenshtein-perl       0.13-1
ii  libtimedate-perl               2.3000-2
ii  liburi-perl                    1.74-1
ii  libxml-simple-perl             2.25-1
ii  libyaml-libyaml-perl           0.74+repack-1
ii  man-db                         2.8.4-2
ii  patchutils                     0.3.4-2
ii  perl [libdigest-sha-perl]      5.26.2-7
ii  t1utils                        1.41-2
ii  xz-utils                       5.2.2-1.3

Versions of packages lintian recommends:
ii  libperlio-gzip-perl  0.19-1build3

Versions of packages lintian suggests:
pn  binutils-multiarch     <none>
ii  dpkg-dev               1.19.0.5ubuntu5
ii  libhtml-parser-perl    3.72-3build1
ii  libtext-template-perl  1.53-1

-- no debconf information

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