Consolidate network settings, common tcp settings, and generalized port settings

[kimchy]

Create common tcp settings for network.tcp.no_delay, network.tcp.keep_alive, network.tcp.reuse_address, network.tcp.send_buffer_size, and network.tcp.receive_buffer_size. Specific settings still exists (the netty ones per module of transport/http/memcached).

Also, create a more simplified setting for ports. Transport port can be set using transport.tcp.port (on top of the current transport.netty.port), HTTP port can be set using http.port (on top of http.netty.port), and memcached port can be set using memcached.port (on top of memcached.netty.port).

[kimchy]

Consolidate network settings, common tcp settings, and generalized port settings, closed by 723e47a.

[kimchy]

The docs should also be simplified and remove the netty sub module from it.