guys, I want to make more DNS and HostDB change: https://cwiki.apache.org/confluence/display/TS/HostDBandDNS
the basic idea is, we make HostDB call DNS, move SplitDNS under DNS only, give DNS a more flex Handler logical. after then, we'll make API and Hooking enhangcement etc. any idea? -- --永豪 aka 赵永明
