[casper] Change IBOB IP on the fly

[G Jones]

Hello,
I'd like to add a command to the iBOB to allow setting the LWIP IP
address from tinysh. I'm thinking about a simple command that sets up
the ip[4] array and then calls lwipinit. My question is, will lwipinit
have problems with being called multiple times? Do things like
netif_init, tcp_init, and udp_init malloc stuff that needs to be
freed? Are there convenience functions for doing so?
Thanks,
Glenn