The DNS director allows Varnish to pick backend based on the Host
header provided by the client, and how it resolves in DNS. A suffix
can be added to make it "internal" (see vcl(7)).
    
This includes commits 5062, 5063, 5064, 5099, 5172, 5173, 5174, 5175



git-svn-id: http://www.varnish-cache.org/svn/branches/2.1@5434 d4fa192b-c00b-0410-8231-f00ffab90ce4