Use puppet() instead of shell() to install module dependencies

Author: Morgan Haskel

spec/spec_helper_acceptance.rb

@@ -36,7 +36,7 @@
       end
 
       shell("/bin/touch #{default['puppetpath']}/hiera.yaml")
-      shell('puppet module install puppetlabs-stdlib --version 3.2.0', { :acceptable_exit_codes => [0,1] })
+      on host, puppet('module install puppetlabs-stdlib --version 3.2.0'), { :acceptable_exit_codes => [0,1] }
       on host, puppet('module','install','stahnma/epel'), { :acceptable_exit_codes => [0,1] }
     end
   end