Add rx-copy support to netfront

* xen/net.c (net_data): Add rx_copy field.
(enqueue_rx_buf): When rx_copy != 0, give grant on buffer to domD instead of
issuing a transfer from domD.
(hyp_net_intr): When rx_copy != 0, take back grant on buffer instead of
finishing transfer. Do not panic on packet error, free kmsg on error.
(hyp_net_init): Check for feature-rx-copy in backend, write 1 to
request-rx-copy in such case. Wait for Connected state before continuing.
Only unmap buffer when rx_copy is 0.

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