Drop server-side rebalancing optimization, fix proxy put config

The RebalancePlan object now produces "optimized" plans. I.e., data is not moved to a server that already hosts that data. This means that server-side optimizations to not fetch data the server already has are not needed.

The voldemort config had a parameter to turn proxy puts on/off. Now that they are tested, they should always be on for the sake of making sure rebalances are abortable. Also, the proxy put default number of threads was one. It is now set in the same manner as nio selectors.

Sorry for all the unnecessary white space changes. I need to reset my eclipse settings.