Provide known defaults during upstream install.

The defaults names for the initial organization and location generated
with the `Katello` installer (upstream) are named `Default Organization`
and `Default Location` (note the space between words), but downstream
the names have an underscore in them. By enforcing the use of an
underscore in their names during a `Katello` installation, we can ensure
that we can search for these entities by name.
This works just fine, but note that this is also possible:

```python
run('katello-installer -v -d --foreman-admin-password="{0}"'
    ' --foreman-initial-organization="{1}"'
    ' --foreman-initial-location="{2}"'
    ''.format(admin_password, org_name, loc_name))
```