VOL-1422:  Update docs and docker compose files

- remove deprecated cli
- use updated etcd matching k8s deployment
- remove references to python openolt adapter

Change-Id: I273490233652b03163b77f990a96f4b8847579cb
diff --git a/compose/docker-compose-etcd.yml b/compose/docker-compose-etcd.yml
index cbcb7d5..9c11c3c 100644
--- a/compose/docker-compose-etcd.yml
+++ b/compose/docker-compose-etcd.yml
@@ -19,7 +19,7 @@
   # Single-node etcd server
   #
   etcd:
-    image: "quay.io/coreos/etcd:v3.2.9"
+    image: "quay.io/coreos/etcd:v3.4.1"
     command: [
       "etcd",
       "--name=etcd0",