Could not clean up containers by execute DockerCmd(self, 'rm', "container_name").execute() about autotest-docker

[gouyang]

however it works with below method in other test case, don't know what the difference:
dkrcmd = DockerCmd(self, 'rm', [self.stuff['container_name']])
dkrcmd.execute()

[cevich]

This is a python-language "feature" where strings are iterable sequences of characters. In other words, containing the string inside a list is key, so:

[self.stuff['container_name']] vs. self.stuff['container_name']

Both satisfy the "iterable" condition, and because "duck-typing" is used, see http://en.wikipedia.org/wiki/Duck_typing both are accepted as an "iterable". Here's the docstring (which I see is not properly rendered into documentation): https://github.com/autotest/autotest-docker/blob/master/dockertest/dockercmd.py#L29

BTW: I have run into this exact same problem before. Since you've now hit it, it must be more common than I assumed. I'm open if you @ouyanggh have ideas, but I think there are at least two simple solutions here:

1. Move the __init__() docstring into the main class docstring so the parameter docs show up in the documentation (oops).
2. Add a warning message if subargs is found to be string-like.

[cevich]

Here's where the parameter docs are not rendering properly, it's an issue across all of our code with a cut-paste fix:
http://docker-autotest.readthedocs.org/en/latest/#dockertest.dockercmd.DockerCmdBase

@Lorquas would you mind looking into #1 and #2 above (and any additional ideas you have) for the dockercmd module?

@jzupka Could you help fix the same documentation (#1) problem in the images and container modules?

@ldoktor Could you help fix docker_daemon, networking and subtest?

I'll pick up the remaining modules. Let me know if anyone has questions.

[cevich]

Documentation fix PR: #100

[gouyang]

I will use it in a list so far.

[cevich]

Closing this since fix is in
#100