This rather large update adds the following
- A golang build container used for building golang executables and/or
  containers.
- envoyd, a daemon process that creates and updates the envoy config
  file based on consul's KV store and forces envoy to reload the config
  as it changes.
- Dockerfile(s) and compose files that integrate envoy into the NBI call
  chain to load-balance device-to-core assignment.
- Several developer tools that help build and replace specific
  containers in a running cluster. This allows the build process to be
  separated from the run-time as it will be in production.
- NOTES: A command line needs to be added to envoyd because now the
  values are declared at the start of the file. This will be submitted
  in a subsequent commit along with a change toward a more object
  oriented implementation.

Addressed reviewer comments.
Addressed even more reviewr comments.
Change-Id: Ia2ec825d48d475398e501f396452fb0306673432
diff --git a/compose/docker-compose-envoy-swarm.yml b/compose/docker-compose-envoy-swarm.yml
index 95d6580..a109af9 100644
--- a/compose/docker-compose-envoy-swarm.yml
+++ b/compose/docker-compose-envoy-swarm.yml
@@ -1,5 +1,5 @@
 #
-# This Docker stackfile deploys an envoy proxy container along with one backup.
+# This Docker stackfile deploys an envoy proxy container.
 #
 # The stackfile assumes that overlay network 'voltha_net' has already been
 # created. To deploy the stack, issue the command:
@@ -9,19 +9,20 @@
 
 version: "3"
 services:
-  envoy:
+  voltha:
     image: voltha/envoy:latest
     deploy:
       replicas: 1
     environment:
       DOCKER_HOST_IP: "${DOCKER_HOST_IP}"
     entrypoint:
-      - /usr/local/bin/envoy
-      - -c /etc/envoy/front-proxy/voltha-grpc-proxy.json
+      - /usr/local/bin/envoyd
+      - -t /envoy/voltha-grpc-proxy.template.json
+      - -c /envoy/voltha-grpc-proxy.json
     networks:
       - voltha-net
     ports:
-      - "50556:50556"
+      - "50555:50555"
     volumes:
       - /cord/incubator/voltha/envoy:/etc/envoy