Move facilitator to a neutral dedicated domain
Regardless of #7159 (closed) one (I don't know who) may decides that torproject.org is a good place for the Flashproxy to exist.
I know this defaults to "dcf", but it should not.
- torproject.org is trusted
- the infrastructure is known by core Tor people
- flashproxy.torproject.org could point to another server and don't put more load on the current infrastructure
- It would look like the Tor Project Inc. would be maintaining the flashproxy