Streamline virtual and hardware server listings.

The listing accrued too much stuff and was causing normal listing to be way too wide and complex. Additionally, masking in billing information in order to get the creator of the server added a significant amount of time to the API call.

FQDN column -> just display hostname (without domain name).
cores column -> removed
memory column -> removed
owner column -> removed

Now, only the following columns are shown:
 * id
 * datacenter
 * hostname
 * primary_ip
 * backend_ip
 * action (active transaction)