'Check that Swift container exist
:return: True if exist or None it not'

def test_root_exists(self):

    ret = self.httpclient.request('HEAD', self.base_path)
    if (ret.status_code == 404):
        return None
    if ((ret.status_code < 200) or (ret.status_code > 300)):
        raise SwiftException(('HEAD    request    failed    with    error    code    %s' % ret.status_code))
    return True
