Major Description
The previous implementation actually loaded up the hosts file (in a background thread) and did a get (getbyname_imm) and then set the IPs to match. This works-- but does cause a problem since the port set on it is 0.
What we need to do is have this thread maintain in an in-memory mapping of name -> ip and have it override resolution within hostdb, that way we can use host files and maintain whether reals are up or down.
