VOL-2371 Pre-release voltha 2.2.0;
Remove multi-core configurations

Change-Id: I8445190a5c9e156cf454fc33bd1d37507dc5e304
diff --git a/voltha/requirements.yaml b/voltha/requirements.yaml
index 1062c2d..a6e50db 100644
--- a/voltha/requirements.yaml
+++ b/voltha/requirements.yaml
@@ -20,5 +20,5 @@
     condition: private_kafka_cluster
   - name: voltha-etcd-cluster
     repository: file://../voltha-etcd-cluster
-    version: 2.1.1
+    version: 2.2.0
     condition: private_etcd_cluster