Provide safer default value for rbenv global ruby
Provide safer default value for rbenv global ruby

If no value is provided for the `[:rbenv][:rbenv_global]` attribute
then the most recent version of ruby specified in `[:rbenv][:rubies]`
will be used.

http-418/chef-desktop,http-418/chef-desktop,http-418/chef-desktop,http-418/chef-desktop