Install rake lint when no Gemfile is found
Install rake lint when no Gemfile is found

With the move to ubuntu-trusty, puppet projects without
a Gemfile started to fail due to rake not being installed.

Install rake on this case, as well as needed dependencies
to run contents inside Rakefile.

Change-Id: I39168815bd89eb09a5085edd587184e3f72dfeae

dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config