Overriding pre-existing cluster cfg

Change-Id: I54ed3b178f6714e8326a3a8d31c60b5ae7a02c32
diff --git a/voltha b/voltha
index cc81802..6e96939 100755
--- a/voltha
+++ b/voltha
@@ -1548,6 +1548,12 @@
         espin "$NOT_VERIFIED"
         bspin - "Generating cluster configuration"
 
+        file="$NAME-cluster.cfg"
+
+        if [ -f "$file" ] ; then
+          rm "$file"
+        fi
+
         touch "$NAME-cluster.cfg"
 
         yq w -i "$NAME-cluster.cfg" kind Cluster