Add support to query kubelet's logs and cadvisor's stats through apiserver by passing rawquery

* Also add a thirdparty library: code.google.com/p/go.net/html since it is required to override customized Transport for apiserver Proxy to update HTTPResponse pointing to proper minion.
* Now minion information can be queried as: 1) id=${minion}&query=/stats// or 2) id=${minion}&query=logs/
I also tried that, actually that is my initial version I started from at the beginning, but ran into mystery issue with a nil response. I tried it yesterday again, and had the same result. I also dumped the entire Request, before and after proxied, and comparing them with dumps with this version field by field yesterday, cannot figure it out. It looks like a bug in httputil package. Already spent too much time on this, didn't dive deeper.