~ubuntu-server subscription changes

[robie.basak at canonical.com]

The following subscriptions are missing:
  dacite
  pcs
  python-tornado
  ruby-childprocess
  ruby-daemons
  ruby-ethon
  ruby-eventmachine
  ruby-ffi
  ruby-json
  ruby-mime-types
  ruby-mime-types-data
  ruby-mustermann
  ruby-rack
  ruby-ruby2-keywords
  ruby-sinatra
  ruby-tilt
  thin
Missing subscriptions added