Refs #5429,BZ1102296 - Showing hosts and keys for views

I worry about the scalability of this, as there could be many many systems.  I would argue that the actual bug is wrong.  Content View info should not show systems.  Instead either:

```hammer content-host list --content-view-id=4```
or
```hammer content-view systems --content-view-id=4```

should be used (or both).