In the risserver every bmp server is identified by its address,
specified in the config, but the GetRouters() grpc only presents us with
the name acquired via the BMP session. To clarify the field usage the
router field is renamed to sys_name and an address field is added. The
address field is of type string to match the other grpc methods, which
require a router address to be specified as string.

Co-authored-by: takt <oliver.herms@exaring.de>

* riscli dump-loc-rip: Dump IPv4/IPv6 routes

By default riscli dump-loc-rib will now dump IPv4 and IPv6 routes. The
flags -4 and -6 have been added to restrict dumping to a single address
family.

* riscli dump-loc-rip: Handle EOF from API

* Implement a GetRouters RPC to RIS

This RPC returns all configured routers and their VRF IDs. This can be
used by RIS clients to discovery the routers. The router and the VRF ID
is a required parameter for all other RPCs.

* Update grpc to v1.28.0 to support protoc-gen-go v1.21.0

* Fix test

Co-authored-by: Oliver Herms <oliver.peter.herms@gmail.com>

* Add decoding benchmark

* Add .gitattributes

* Add test data

* Implement decoding speed improvements

* Performance improvements

* Fix tests

* Optimizing values vs ptr.

* Change cache inserts to pointers

* Refactor tests for ip dedup changes

* Fix tests

* Fix types in device protocol tests

* Fix tests

* Fix types in routingtable tests

* Fix kernel package for darwin/win

* Swap BTree with Map

* Drop legacy BMP code

* Drop legacy fib implementation.

* Fix Ptr calls

* Drop unused code

* Drop unused Less functions

* Drop unused copy function

* Drop dead code. Add IP dedup to prefix dedup.

Co-authored-by: Marcus Weiner <marcus.weiner@gmail.com>