Revert "Remove etcd and kafka dependencies from voltha"

This reverts commit d9ce07cc9aa8487f288778cc4ca8bbd23abc6f21.

Change-Id: I63a335712cea962c536359cacc41991ebb409598
diff --git a/voltha/requirements.yaml b/voltha/requirements.yaml
index cef6629..946ac26 100644
--- a/voltha/requirements.yaml
+++ b/voltha/requirements.yaml
@@ -14,7 +14,7 @@
 
 dependencies:
 - name: etcd-operator
-  version: 0.8.0
+  version: 0.7.3
   repository: https://kubernetes-charts.storage.googleapis.com/
   condition: etcd.operator.enabled
 - name: consul