Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1477341

Description of problem:
When using UI CSV export of facts. The values of columns with nested fields is empty for example:
```
ronda-grams.lab.eng.rdu2.redhat.com,dmi,,Redhat,2017-07-20 18:29:07 UTC
```
See attached screen shot for page.
Although it is shown as empty on the ui page, we probably should show something in the CSV.

For example, we could build a json-like dict by traversing down the tree:
```
ronda-grams.lab.eng.rdu2.redhat.com,{"dmi::bios::version": "0.5.1", "dmi::bios::rom_size":"64 KB", ...},...
```

Version-Release number of selected component (if applicable): 6.3.0