Bugfix list zip

[belldandyxtq]

This PR fixes the two bugs mentioned in #66
Closes #66

[kuenishi]

A bugfix must include a test (case) that reproduces the bug.

[kuenishi]

Also, this introduces non-compat change on trailing slash, so it would be nice mentioned somewhere at the release time

[kuenishi]

The code seems good at a glance, but it's actually still broken.

$ unzip -l tmp3.zip 
Archive:  tmp3.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
        0  2019-10-04 10:13   tmp/
    62672  2019-09-13 10:53   tmp/tmp.zip
        0  2019-10-04 10:13   tmp/in/
    62980  2019-10-04 10:13   tmp/in/tmp2.zip
---------                     -------
   125652                     4 files

>>> import chainerio as chio
>>> z = chio.open_as_container('tmp3.zip')
>>> list(z.list('tmp', recursive=True))
['tmp/', 'tmp/tmp.zip', 'tmp/in/', 'tmp/in/tmp2.zip']
>>> list(z.list('tmp/in', recursive=True))
['tmp/', 'tmp/tmp.zip', 'tmp/in/', 'tmp/in/tmp2.zip']
>>> list(z.list('tmp//in', recursive=True))
['tmp/', 'tmp/tmp.zip', 'tmp/in/', 'tmp/in/tmp2.zip']
>>> list(z.list('tmp//in'))
[]

I think the double-slash bug also resides in HDFS listing code, which also does prefix matching.

[kuenishi]

A few more examples:

>>> list(z.list('t'))
['mp']
>>> list(z.list('a'))
['tmp']
>>> list(z.list('/'))
['tmp']
>>> list(z.list('tm'))
['p']
>>> list(z.list('tmp/i'))
['tmp', 'n']
>>> list(z.list('tmp/in/tm'))
['tmp', 'p2.zip']
>>> list(z.list('tmp/tm'))
['tmp', 'p.zip']

[belldandyxtq]

For the recursive case, it is known and supposed to be fixed in #72, which has conflicts with this PR and will be rebased after this is merged

[belldandyxtq]

I do not think double-slash bug exists in hdfs list as it is not using "prefix matching" as we did here.

>>> list(chainerio.list('hdfs:///user/tianqi//tesetdir///'))
['test']

It first checks the state of the file and used the "converted and normalized path" as the prefix.
https://github.com/chainer/chainerio/blob/af3b45b5d1f84db87cf73fee4bce9cc10a6d1039/chainerio/filesystems/hdfs.py#L145