Add join_swarm default listen address

[mbelang]

Since the docker CLI adds a default listen address (0.0.0.0:2377)
when joining a node to the swarm, the docker-py api will support
the same behavior.

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "join-swarn-default-listen-address" git@github.com:mbelang/docker-py.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[mbelang]

Build failed, don't know why, I didn't touch that part of the code.
Here is the error:

20:33:19 [py2.7_1.13.1] =================================== FAILURES ===================================
20:33:19 [py2.7_1.13.1] ________________________ PluginTest.test_enable_plugin _________________________
20:33:19 [py2.7_1.13.1] tests/integration/api_plugin_test.py:49: in test_enable_plugin
20:33:19 [py2.7_1.13.1]     assert self.client.enable_plugin(SSHFS)
20:33:19 [py2.7_1.13.1] docker/utils/decorators.py:34: in wrapper
20:33:19 [py2.7_1.13.1]     return f(self, *args, **kwargs)
20:33:19 [py2.7_1.13.1] docker/api/plugin.py:85: in enable_plugin
20:33:19 [py2.7_1.13.1]     self._raise_for_status(res)
20:33:19 [py2.7_1.13.1] docker/api/client.py:222: in _raise_for_status
20:33:19 [py2.7_1.13.1]     raise create_api_error_from_http_exception(e)
20:33:19 [py2.7_1.13.1] docker/errors.py:31: in create_api_error_from_http_exception
20:33:19 [py2.7_1.13.1]     raise cls(e, response=response, explanation=explanation)
20:33:19 [py2.7_1.13.1] E   APIError: 500 Server Error: Internal Server Error ("error setting up propagated mount dir: invalid argument")
20:33:19 [py2.7_1.13.1] === 1 failed, 250 passed, 10 skipped, 2 xfailed, 1 xpassed in 328.52 seconds ===

If somebody could help me understand the nature of the problem, it would be appreciated.

[mbelang]

Hum I guess a test is/was flaky, rerunning without any change: All green!

[shin-]

Thank you - and sorry for the late review!

[mbelang]

no worries :)