Can't read encodings about ops

[erectcrested]

https://github.com/nanovms/nanos/issues/202

[mkhon]

Reading from files was broken (fixed in nanovms/nanos#426).

Python 2.7 works with the following config:

{
    "Files": [ "hello.py" ], 
    "Args": [ "python", "hello.py" ],
    "Env": { "HOME": "/", "PYTHONDONTWRITEBYTECODE": "1" },
    "MapDirs": {
        "linux-python2.7-venv/lib/*": "/usr/lib"
    }
}

Where linux-python2.7-venv was created using virtualenv:

virtualenv --always-copy linux-python2.7-venv
find linux-python2.7-venv -name '* *' -delete # filenames with spaces are not supported