* 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>

* Fix type assertions

* Fix type assertion

* Remove debug output

* Add caches

* Replace IPs and Prefixes with pointers to these

* Fix nil pointer derefs

* Fix nil pointer deref

* Fix community encoding

* Fix tests

* Fix tests

* Fix tests

* Fix tests

* Fix tests

* Fix tests

* Fix BGP path hashing

* Fix path attr decoding

* Fix tests

* Fix tests

* Fix tests

* Fix tests

* Cleanup

* Cleanup

* Revert config change

* Fix Benchmark. Fix ClusterList PA.

* Fix ClusterList tests

* Add client

* Remove stale test

* Cleanup

* Increase verbosity on decode failure

* Improve chache layer performance

* Improve bgp path cache performance

* Cleanup

* Implementing basic daemon with configuration

* Add daemon

* Implement hot reloadable filters

* Adding more filter actions

* Make filters comparable

* Fix tests

* Fix tests

* Fix tests

* Cleanup

* Cleanup

* Cleanup

* Use documentation prefixes rfc5737

* Correct one prefix

* Fix copy&paste error

* Make BMP server VRF aware

* Implement RIS service

* Remove binary

* Fix .gitignore

* Implement more RPCs

* Implement RIB Observer

* Fix tests

* Implement RIB Dump

* Add support for translating proto BGP Paths into internal paths

* Cleanup

* Fix peer down

* Implement buffered update receiver. Fix route propagation.

* Add metrics

* Add VRF metrics

* Add router label to VRF metrics

* Add peer metrics

* Fix tests

* Fix test

* Fix test

* Fix build

* Add tests

* Add test for unknown path attributes

* Add tests

* Extend test

* Standardize grpc API

* Fix tests

This enables users of the bio-rd library to reuse the state numbering.
Otherwise users have to maintain their own constats to avoid magic
numbers.

* first steps to metrics

* next small step

* fixed tests

* added comments

* postponed RouterAccepted and RoutesRejected to next step

* read update counters

* added test

* added missing test file

* Route not used any more

* added metrics for session state and time since establish

* increased test coverage, time since establish impl.

* added prom collector

* added metrics endpoint to BGP example

* added metrics for VRF

* removed commented metrics

* fixed logging inconsistency in example

* Update main.go

* gofmt

* fixed typo

* sane default for ClientOptions, otherwise max paths for non add path is 0

* applied new default to BMP test

* added regression test

* Fix FSM Address Family Init

* Adding tests for fix

* Fix build

* Fix build

* Adding support for dumping BGP RIBin & RIBout

* Fix build

* Add API Server to BGP IPv4 example

* Re-factored Route dumping API to use streaming RPC

* Add benchmark

* Get rid of holdtimer as a timer

* Fix tests

* Completing benchmark

* Fix atomic stuff

* added unique name for locRIBs

* added VRFs

* added error when no RIB configured in VRF

* vrf unique name ensurance

* fixed examples

* added missing test

* for convenience we provide a default RIB for v4 and v6 on each VRF

* removed debug output in main.go (api is coming)

* also removed debug output from fib example

* removed fib example