Specify listen port in required format

[jzoldak]

Fixes a current issue on master, in which the twistd server will not start up, but instead gives the following error. Note that pip freeze shows Twisted==17.1.0.

File "/Users/foo/.virtualenvs/venv/bin/twistd", line 11, in <module>
    sys.exit(run())
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/scripts/twistd.py", line 29, in run
    app.run(runApp, ServerOptions)
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/application/app.py", line 662, in run
    runApp(config)
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/scripts/twistd.py", line 25, in runApp
    _SomeApplicationRunner(config).run()
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/application/app.py", line 380, in run
    self.application = self.createOrGetApplication()
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/application/app.py", line 440, in createOrGetApplication
    ser = plg.makeService(self.config.subOptions)
  File "/Users/foo/repos/mimic/mimic/tap.py", line 39, in makeService
    service(config['listen'], site).setServiceParent(s)
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/application/strports.py", line 40, in service
    endpoints.serverFromString(reactor, description), factory)
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/internet/endpoints.py", line 1569, in serverFromString
    nameOrPlugin, args, kw = _parseServer(description, None)
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/internet/endpoints.py", line 1487, in _parseServer
    getPlugins(IStreamServerEndpointStringParser), endpointType
  File "/Users/foo/.virtualenvs/venv/lib/python3.6/site-packages/twisted/internet/endpoints.py", line 1503, in _matchPluginToPrefix
    raise ValueError("Unknown endpoint type: '%s'" % (endpointType,))
ValueError: Unknown endpoint type: '8900'

[glyph]

Thanks @jzoldak .

Would you mind removing twistd.log from the .gitignore in this change? It's a separate issue that shouldn't be rolled into the same fix. (I actually think it shouldn't be ignored at all, but don't want to quibble about that while getting this important fix in :))

[glyph]

Since the tests are failing and this includes an irrelevant change, I'm going to close it. But the problem is very real! If you have a fix that addresses the problem and passes the tests, please re-open.

[jzoldak]

Thx for the look @glyph.

Removed the change to .gitignore Working on the tests. I don't have permissions to reopen so I'll put in a new PR once I get the tests sorted out.