Remove non LTS Ubuntu 15.04 from metadata.json
Remove non LTS Ubuntu 15.04 from metadata.json

ppp0/puppet-packages,njam/puppet-packages,njam/puppet-packages,njam/puppet-packages,ppp0/puppet-packages,cargomedia/puppet-packages,njam/puppet-packages,njam/puppet-packages,ppp0/puppet-packages,ppp0/puppet-packages,ppp0/puppet-packages,cargomedia/puppet-packages,cargomedia/puppet-packages,cargomedia/puppet-packages,cargomedia/puppet-packages