[router] IPv6 support and refactoring.

This change adds support for IPv6 while refactoring most of the
original plugin code in the following ways.

 - Adhere to vpp style guidelines.

 - Split the netlink, node, and tap processing into separate
   files named with a "tap_inject" prefix which more accurately
   represents the functionality.

 - Implement our own tap management and rx/tx. This is to reduce
   the overhead of passing packets in and out of vnet tap
   devices, in favor of directly reading/writing from the tap.

 - Change how nodes work. Now we have neighbor, rx, and tx nodes.
   The neighbor node sends ARP replies and ICMP6 neighbor
   advertisements to the arp-input and icmp6-neighbor-solicitation
   nodes, respectively, before also injecting the packet to the
   host, making it possible for both vpp and the host network stack
   to resolve the next hop. The tx node injects packets into the
   host by writing to the tap. The rx node reads packets from the
   tap and sends them on its associated data plane interface.

 - Simplify the CLI. Instead of creating taps specifically for
   a given interface we create a tap for all of the Ethernet
   interfaces with the "enable tap-inject" CLI command. The
   interfaces are named with a "vpp" prefix, i.e. "vpp0". Also
   add a "disable tap-inject" option.

 - Provide ability to enable at configuration time with the
   tap-inject { enable } stanza.

Change-Id: I6b56da606e2da1d793ce6aca222fe4eb5a4e070d
Signed-off-by: Jeff Shaw <jeffrey.b.shaw@intel.com>

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