Display the site's network provider on the results page

[gwire]

(This is possibly a request for both the backend data collection, and the frontend.)

The results page for a site should show the hosting network, ie the name associated with the AS number that advertises the IP address/addresses for the site.

In a lot of cases sites will have different addresses based on the location of the probes, eg where their endpoints are handled by CDNs with multiple local points-of-presence, but these should (mostly) resolve to the same AS operator.

(Also, obviously we'd need to ignore instances where DNS lookups are hijacked to redirect users to an ISP's own server, eg for a block page.)