The Slackware 14.2 CI job is failing

[exarkun]

Traceback (most recent call last):
testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/tmp/tahoe-lafs.tox/coverage/lib/python2.7/site-packages/twisted/internet/defer.py", line 654, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/tmp/project/src/allmydata/test/test_runner.py", line 108, in _cb
    "We don't know our version, because this distribution didn't come "
  File "/tmp/tahoe-lafs.tox/coverage/lib/python2.7/site-packages/twisted/trial/_synctest.py", line 475, in assertNotEqual
    raise self.failureException(msg or '%r == %r' % (first, second))
twisted.trial.unittest.FailTest: We don't know our version, because this distribution didn't come with a _version.py and 'setup.py update_version' hasn't been run.

and

Traceback (most recent call last):
testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/tmp/tahoe-lafs.tox/coverage/lib/python2.7/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
    result = g.send(result)
  File "/tmp/project/src/allmydata/test/test_client.py", line 508, in test_versions
    self.failIfEqual(str(allmydata.__version__), "unknown")
  File "/tmp/tahoe-lafs.tox/coverage/lib/python2.7/site-packages/twisted/trial/_synctest.py", line 475, in assertNotEqual
    raise self.failureException(msg or '%r == %r' % (first, second))
twisted.trial.unittest.FailTest: 'unknown' == 'unknown'

[GitHub <noreply@…>]

In b88f166/trunk:

Merge pull request #541 from tahoe-lafs/2961.circleci-slackware.14-2

Fix CircleCI Slackware 14.2 job

Fixes: ticket:2961