Adjust virtlet-ds.yaml and bump virtlet to 1.0.3

Change-Id: If88c0335bed215426bac630e9d0bdbe5b39559b7
diff --git a/README.rst b/README.rst
index 3b50609..da82ccb 100644
--- a/README.rst
+++ b/README.rst
@@ -70,7 +70,7 @@
             virtlet:
               enabled: true
               namespace: kube-system
-              image: mirantis/virtlet:v1.0.0
+              image: mirantis/virtlet:v1.0.3
               hosts:
               - cmp01
               - cmp02