if_vtnet: Recognize VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.

Just adds the #define and prints a name for the feature bit instead of
the raw hex number in dmesg.

if_vtnet: Use SetMacAddress feature; Add some new feature flags.

* If the VTNET_FLAG_CTRL_MAC and VTNET_FLAG_CTRL_RX features are
available, we should set the MAC address via a control message.

*

if_vtnet: Use SetMacAddress feature; Add some new feature flags.

* If the VTNET_FLAG_CTRL_MAC and VTNET_FLAG_CTRL_RX features are
available, we should set the MAC address via a control message.

* Add VIRTIO_NET_F_GUEST_ANNOUNCE feature flag.
* Add VIRTIO_CONFIG_STATUS_DEVICE_NEEDS_RESET device status bit.

* Do some reordering of function declarations/implementations to reduce
differences to FreeBSD's code a bit.

Taken-From: FreeBSD

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Importing slightly modified virtio-net by vsrinivas

* TSO and LRO are off for now by default.

* Makefile changes. Adapting manpages. Fixing a typo in vtnet_tx_offload.

* Allocating tx headers with

Importing slightly modified virtio-net by vsrinivas

* TSO and LRO are off for now by default.

* Makefile changes. Adapting manpages. Fixing a typo in vtnet_tx_offload.

* Allocating tx headers with contigmalloc during attach instead of using
kmalloc in the transmit path.
In the worst case we need one tx header for two virtqueue ring entries.

* Additionally some whitespace fixes

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