doc updates

Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/traffic/HACKING.md

-# Hacking on *traffic*
-
-Repos used:
-
-<https://github.com/envoyproxy/go-control-plane>
-:   implements control plane, has testing stuff in pkg/test/main (iirc).
-
-<https://github.com/grpc/grpc-go/tree/master/xds/internal/client>
-:   implements client for xDS - much of this code has been reused here.
-
-I found these website useful while working on this.
-
-* https://github.com/envoyproxy/envoy/blob/master/api/API_OVERVIEW.md
-* https://github.com/envoyproxy/learnenvoy/blob/master/_articles/service-discovery.md
-* This was *really* helpful: https://www.envoyproxy.io/docs/envoy/v1.11.2/api-docs/xds_protocol to
-  show the flow of the protocol.
-
-# Testing
-
-Assuming you have envoyproxy/go-control-plane checked out somewhere, then:
-
-~~~ sh
-% cd ~/src/github.com/envoyproxy/go-control-plane/pkg/test/main
-% go build
-% ./main --xds=ads --runtimes=2 -debug
-~~~
-
-This runs a binary from pkg/test/main. Now we're testing aDS. Everything is using gRPC with TLS
-disabled: `grpc.WithInsecure()`. The test binary runs on port 18000 on localhost; all these things
-are currently hardcoded in the *traffic* plugin. This will be factored out into config as some
-point. Another thing that is hardcoded is the use of the "example.org" domain.
-
-Then for CoreDNS, check out the `traffic` branch, create a Corefile:
-
-~~~ Corefile
-example.org {
-    traffic grpc://127.0.0.1:18000 {
-        id test-id
-        ignore_health
-    }
-    debug
-}
-~~~
-
-You'll need `ignore_health` because the test binary sets the health status to UNKNOWN and this would
-mean CoreDNS doesn't return any (useful) data.
-
-Start CoreDNS (`coredns -conf Corefile -dns.port=1053`), and see logging/debugging flow by; the
-test binary should also spew out a bunch of things. CoreDNS willl build up a list of cluster and
-endpoints. Next you can query it. Note none of the endpoints are HEALTHY so you'll mostly get NODATA
-responses, instead of actual records.
-
-Note: the xds/test binary is a go-control-plane binary with added debugging that I'm using for
-testing.

plugin/traffic/README.md

@@ -41,7 +41,8 @@ responding server (CoreDNS) has no idea how many clients use this resolver. So r
 +1 on the CoreDNS side can results in anything from 1 to 1000+ of queries on the endpoint, making
 the load reporting from *traffic* highly inaccurate.
 
-*Traffic* implements version 3 of the xDS API.
+*Traffic* implements version 3 of the xDS API. It works with the management server as written in
+<https://github.com/miekg/xds>.
 
 ## Syntax
 
@@ -162,3 +163,8 @@ localhost on port 18000. The node ID will be `test-id` and no TLS will be used.
 
 Priority and locality information from ClusterLoadAssignments is not used. Multiple **TO** addresses
 is not implemented. Credentials are not implemented.
+
+## Also See
+
+A Envoy management server and command line interface can be found on
+[GitHub](https://github.com/miekg/xds).