age-restricted dailymotion videos fail to download

[phihag]

Reported on IRC:

$ youtube-dl http://www.dailymotion.com/video/xyh2zz_leanna-decker-cyber-girl-of-the-year-desires-nude-playboy-plus_redband -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['http://www.dailymotion.com/video/xyh2zz_leanna-decker-cyber-girl-of-the-year-desires-nude-playboy-plus_redband', '-v']
[debug] youtube-dl version 2013.10.30
[debug] Git HEAD: 33b1d95
[debug] Python version 2.7.5+ - Linux-3.4-trunk-amd64-x86_64-with-debian-jessie-sid
[debug] Proxy map: {}
[dailymotion] xyh2zz: Downloading webpage
[dailymotion] xyh2zz: Extracting information
ERROR: Unable to extract video uploader; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type  youtube-dl -U  to update.
Traceback (most recent call last):
  File "youtube_dl/YoutubeDL.py", line 342, in extract_info
    ie_result = ie.extract(url)
  File "youtube_dl/extractor/common.py", line 122, in extract
    return self._real_extract(url)
  File "youtube_dl/extractor/dailymotion.py", line 93, in _real_extract
    webpage, 'video uploader')
  File "youtube_dl/extractor/common.py", line 267, in _search_regex
    raise RegexNotFoundError(u'Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract video uploader; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type  youtube-dl -U  to update.

Additionally, all the information is wrong. We should mark uploader as non-fatal, test for age_limit: 18, and make sure that everything works.

[jaimeMF]

Setting the ff cookie to off seems to fix the issue, but I haven't checked with other age-restricted videos, maybe they have just changed the name of the cookie.
When fixing it we also have to add a test video, so that we know when it breaks.