1019250: Showing/fixing system info

Link to the original methods in consumer:

memory
https://github.com/daviddavis/katello/blob/cf3fb8d953caac9b61e5136533f47a476ba8be99/app/models/glue/candlepin/consumer.rb#L359-L368

memory_in_gigabytes
https://github.com/daviddavis/katello/blob/cf3fb8d953caac9b61e5136533f47a476ba8be99/app/models/glue/candlepin/consumer.rb#L403-L418