Match the values to AFI and SAFI extensions supported by MBGP

Match the values to AFI and SAFI extensions supported by MBGP. (Not all options are used.)

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To expand the support for multiple network layer protocols to original BGP-4, RFC 2858 added Multiprotocol BGP (MBGP/MP-BGP) capability by adding an extension called the address family identifier (AFI). An address family correlates to a specific network protocol, such as IPv4 or IPv6, and additional granularity is provided through a subsequent address family identifier (SAFI) such as unicast or multicast.