Update managed_modules.yml adding it-puppet-module-dmlite, it-puppet-module-dpm,…
… it-puppet-module-lcgdm, it-puppet-module-gridftp, it-puppet-module-xrootd, it-puppet-module-sts, it-puppet-module-fts
… it-puppet-module-lcgdm, it-puppet-module-gridftp, it-puppet-module-xrootd, it-puppet-module-sts, it-puppet-module-fts