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
           -dpdk complains if you assign all the buffers to the dev rxq/txq, since it cannot get any new free buffers to replish the queues.