Warning: dependency 'characteristic' not found

[sajith]

Per #2766, the dependency 'characteristic' must have gone away, but it is still lingering:

./venv/bin/tahoe --version
tahoe-lafs: 1.13.0.post1453.dev0 [master: 5bd84895fdc436feb0753e824044a016430896da-dirty]
foolscap: 0.13.1
zfec: 1.5.3
Twisted: 19.10.0
Nevow: 0.14.5
zope.interface: unknown
python: 2.7.17
platform: Linux-debian_bullseye/sid-x86_64-64bit
pyOpenSSL: 19.1.0
OpenSSL: 1.1.1d [ 10 Sep 2019]
pyasn1: 0.4.8
service-identity: 18.1.0
characteristic: None [(<type 'exceptions.ImportError'>, 'No module named characteristic', ('/home/sajith/projects/tahoe/tahoe-lafs/src/allmydata/version_checks.py', 356, '_get_package_versions_and_locations', '__import__(modulename)'))]
pyasn1-modules: 0.2.8
cryptography: 2.8
cffi: 1.13.2
six: 1.14.0
enum34: 1.1.6
pycparser: 2.19
PyYAML: 5.3
magic-wormhole: 0.11.2
setuptools: 44.0.0
eliot: 1.7.0
attrs: 19.3.0
autobahn: 19.11.2
tqdm: 4.42.0 [according to pkg_resources]
constantly: 15.1.0 [according to pkg_resources]
txtorcon: 19.1.0 [according to pkg_resources]
automat: 0.8.0 [according to pkg_resources]
boltons: 20.0.0 [according to pkg_resources]
click: 7.0 [according to pkg_resources]
appdirs: 1.4.3 [according to pkg_resources]
pyutil: 3.3.0 [according to pkg_resources]
humanize: 0.5.1 [according to pkg_resources]
hkdf: 0.0.3 [according to pkg_resources]
bcrypt: 3.1.7 [according to pkg_resources]
txaio: 18.8.1 [according to pkg_resources]
pynacl: 1.3.0 [according to pkg_resources]
ipaddress: 1.0.23 [according to pkg_resources]
hyperlink: 19.0.0 [according to pkg_resources]
spake2: 0.8 [according to pkg_resources]
pyhamcrest: 1.10.1 [according to pkg_resources]
pyrsistent: 0.15.7 [according to pkg_resources]
incremental: 17.5.0 [according to pkg_resources]
idna: 2.8 [according to pkg_resources]

Warning: dependency 'characteristic' (version None imported from None) was not found by pkg_resources.

For debugging purposes, the PYTHONPATH was
  None
install_requires was
  ['setuptools>=28.8.0', 'zfec>=1.1.0', 'zope.interface!=3.6.3,!=3.6.4,>=3.6.0', 'foolscap==0.13.1', 'cryptography>=2.6', 'Twisted[conch,tls]>=18.4.0', 'Nevow>=0.11.1', 'PyYAML>=3.11', 'six>=1.10.0', 'magic-wormhole>=0.10.2', 'eliot~=1.7', 'attrs>=18.2.0', 'autobahn>=19.5.2']
sys.path after importing pkg_resources was
  /home/sajith/projects/tahoe/tahoe-lafs/venv/bin:
  /home/sajith/projects/tahoe/tahoe-lafs/venv/lib/python2.7:
  /home/sajith/projects/tahoe/tahoe-lafs/venv/lib/python2.7/plat-x86_64-linux-gnu:
  /home/sajith/projects/tahoe/tahoe-lafs/venv/lib/python2.7/lib-tk:
  /home/sajith/projects/tahoe/tahoe-lafs/venv/lib/python2.7/lib-old:
  /home/sajith/projects/tahoe/tahoe-lafs/venv/lib/python2.7/lib-dynload:
  /usr/lib/python2.7:
  /usr/lib/python2.7/plat-x86_64-linux-gnu:
  /usr/lib/python2.7/lib-tk:
  /home/sajith/projects/tahoe/tahoe-lafs/venv/local/lib/python2.7/site-packages:
  /home/sajith/projects/tahoe/tahoe-lafs/src:
  /home/sajith/projects/tahoe/tahoe-lafs/venv/lib/python2.7/site-packages

[Sajith Sasidharan <sajith@…>]

In 26c7282/trunk:

Remove characteristic dependency

Fixes: ticket:3279

[GitHub <noreply@…>]

In 09f8fa1/trunk:

Merge pull request #688 from sajith/3279.remove-characteristic

Remove checks for old characteristic dependency

Fixes: ticket:3279