bgpd: make bgp_table a wrapper around table library

Make the BGP table code a thin wrapper around the table implementation
in libzebra.

  * bgpd/bgp_table.[ch]

    - Use the ROUTE_NODE_FIELDS macro to embed the fields of a
      route_node in the bgp_node structure.

    - Add a route_table field to the bgp_table structure.

      Initialize the route_table with a delegate, such that the nodes
      in the table are bgp_node structures.

    - Add inline wrappers that call route_table functions underneath,
      and accept/return the correct BGP types.

  * bgpd/bgp_route.c

    Change some code to use inline wrappers instead of accessing
    fields of nodes/tables directly. The latter does not always work
    because the types of some fields need to be translated now.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

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