Log Message:
youtube-dl: Update net/youtube-dl to 20171029

Changes:
version 2017.10.29

Core
* [extractor/common] Prefix format id for audio only HLS formats
+ [utils] Add support for zero years and months in parse_duration

Extractors
* [egghead] Fix extraction (#14388)
+ [fxnetworks] Extract series metadata (#14603)
+ [younow] Add support for younow.com (#9255, #9432, #12436)
* [dctptv] Fix extraction (#14599)
* [youtube] Restrict embed regex (#14600)
* [vimeo] Restrict iframe embed regex (#14600)
* [soundgasm] Improve extraction (#14588)
- [myvideo] Remove extractor (#8557)
+ [nbc] Add support for classic-tv videos (#14575)
+ [vrtnu] Add support for cookies authentication and simplify (#11873)
+ [canvas] Add support for vrt.be/vrtnu (#11873)
* [twitch:clips] Fix title extraction (#14566)
+ [ndtv] Add support for sub-sites (#14534)
* [dramafever] Fix login error message extraction
+ [nick] Add support for more nickelodeon sites (no, dk, se, ch, fr, es, pt,
  ro, hu) (#14553)