Prior to this there was generic :test group.
Unfortunately Beaker will be EOL-ing support for Ruby 1.8 (a number of
Beaker's dependencies already have and pinning to older versions is
becoming costly). Once Beaker does this it will cause failures whenever
running `bundle install`.
To avoid this failure we can segregate the system testing gems, allowing
unit, lint and development to continue with
`bundle install --without system_tests`.
This work updates a number of Gems to the latest versions (rspec,
rspec-puppet), and updates and tweaks a bunch of tests to work
with the updated gems.
