vlc-debian-unstable: drop ssh (and jenkins) support

1 job for master in 13 seconds (queued for 16 seconds)
Status Job ID Name Coverage
  Build
failed #272519
build

00:00:13

 
Name Stage Failure
failed
build Build
+ echo 'Changed images: '"'"' vlc-debian-unstable'"'"
Changed images: ' vlc-debian-unstable'
+ '[' -d vlc-debian-unstable ]
+ date '+%Y%m%d%H%M%S'
+ DATE=20190416182049
+ docker build -t registry.videolan.org/vlc-debian-unstable:20190416182049 vlc-debian-unstable/
Sending build context to Docker daemon 3.584kB
Error response from daemon: Dockerfile parse error line 15: unknown instruction: DDGROUP
ERROR: Job failed: exit code 1