Speed up Webserver demo data rate by not sending a full ethernet frame each time, preventing the receiver from using a delayed ACK scheme which slows down the connection. TELNET server cleanup.

Move DHCP negotiation timer into the DHCP connection application state structure, so that each connection gets its own timeout counter (only one connection currently used, but this way is more correct). Add const correctness to static data in the TELNETServerApp.c and HTTPServerApp.c files.