(pup-1712) Don't install rubygems on trusty (package no longer exists)
Merge pull request #2567 from kylog/issue/pup-1712/dont-try-to-install-rubygems-on-trusty

(pup-1712) Don't install rubygems on trusty (package no longer exists)
Merge branch 'master' of https://github.com/puppetlabs/puppet