modified:   examples/udp_echo_server/udp_echo_server.c
	    Fixed bug, the buffer was not echo'ed as supposed too. An empty buffer was send, instead of the received message

modified:   src/libdpdkif/dpdkif_user.c
	    Make it work on vmxnet3: vmxnet3 interfaces do not support multisegment transmit and require a least 512 buffer descriptors