Log Message:
bash-completion: Update shells/bash-completion to 2.8

Patch provided by Attila Fülöp via netbsd/pkgsrc#36, thanks!

pkgsrc changes:
 - Update MASTER_SITES and HOMEPAGE

Changes:
Unfortunately the changelog is very long. Only new/removed completions/helpers
are documented here (since 2.1):

The following completions were added:
 - 2to3, 7z, 7za, _cal, _chfn, _chsh, _dmesg, _eject, _hexdump,
   _hwclock, _ionice, _look, _mock, _modules, _newgrp, _nmcli, _renice,
   _repomanage, _reptyr, _rfkill, _rtcwake, _runuser, _su, _svn,
   _svnadmin, _svnlook, _udevadm, _write, _yum, aclocal-1.10,
   aclocal-1.12, aclocal-1.13, aclocal-1.14, aclocal-1.15, adb,
   appdata-validate, aptitude-curses, automake-1.10, automake-1.12,
   automake-1.13, automake-1.14, automake-1.15, bind, bts, ccze,
   checksec, createuser, deja-dup, dropuser, ebtables, f77, f95,
   flake8, freebsd-update, g95, geoiplookup, geoiplookup6, getconf,
   gfortran, gm, gnokii, hostname, jpegoptim, jshint, lsscsi, lsusb,
   lz4, lz4c, micropython, mr, nproc, oggdec, optipng, pdftotext,
   perltidy, pngfix, portsnap, pv, py.test, py.test-2, py.test-3,
   pycodestyle, pyflakes, pylint-2, pylint-3, pypy, pypy3, pyvenv,
   pyvenv-3.4, pyvenv-3.5, qemu-kvm, qemu-system-i386, qemu-system-x86_64,
   radvdump, sidedoor, ssh-keygen, synclient, timeout, tipc, tox,
   xdg-mime, xdg-settings, zopfli, zopflipng, python,

The following completions were removed:
 - cal, chsh, dmesg, eject, hexdump, hwclock, ionice, look, newgrp,
   nmcli, renice, reptyr, rfkill, rtcwake, su,

The following helpers were added:
 - python