(PDB-2004) Don't 'rvm use' in before_install
(PDB-2004) Don't 'rvm use' in before_install

It doesn't appear to work with containers, and it also looks like you
can't use the .travis.yml "rvm:" settings to select the ruby version
unless you have a "language: ruby" project.  (Though since ruby projects
also support "jdk:", that might be a future alternative.)

wkalt/puppetdb,senior/puppetdb,waynr/puppetdb,grimradical/puppetdb,puppetlabs/puppetdb,senior/puppetdb,wkalt/puppetdb,puppetlabs/puppetdb,wkalt/puppetdb,rbrw/puppetdb,senior/puppetdb,puppetlabs/puppetdb,kbarber/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,grimradical/puppetdb,rbrw/puppetdb,rbrw/puppetdb,grimradical/puppetdb,waynr/puppetdb,mullr/puppetdb,senior/puppetdb,rbrw/puppetdb,mullr/puppetdb,waynr/puppetdb,kbarber/puppetdb,grimradical/puppetdb,rbrw/puppetdb,wkalt/puppetdb,kbarber/puppetdb,mullr/puppetdb,waynr/puppetdb