libnet: added possiblity to query own IP address

Signed-off-by: Roni Häcki <roni.haecki@inf.ethz.ch>

libnet: dhcp header file removed unneeded include

Signed-off-by: Roni Häcki <roni.haecki@inf.ethz.ch>

tftpclient: converting to net sockets
net_sockets: adding local/remote addresses/ports to the net_socket structure
net,dhcp: adding a possibility of setting of static IP

Signed-off-by: Adam Turowski <adam.turowski@inf.ethz.ch>

net: converting lwip types to bsd types

Signed-off-by: Adam Turowski <adam.turowski@inf.ethz.ch>

libc: removing newlib, adding BSD libc
posixcompat: moving gettimeofday to libc
harness: adding a simple math test
lwip, lwip2: moving includes to /include, compiling with BSD headers

Signed-off-by: Adam Turowski <adam.turowski@inf.ethz.ch>