Switch hyperkube source to binary instead of docker image.

Since docker going to be removed from k8s formula,
hyperkube should be downloaded as raw binary.

Related story: PROD-23498

Change-Id: I41929df3a43aa8e929e370a2a92c79a00f2572e8
diff --git a/tests/pillar/master_cluster.sls b/tests/pillar/master_cluster.sls
index a61ce7e..b7b21d3 100644
--- a/tests/pillar/master_cluster.sls
+++ b/tests/pillar/master_cluster.sls
@@ -4,7 +4,8 @@
     cluster_name: cluster
     hyperkube:
       image: hyperkube-amd64:v1.6.4-3
-      hash: hnsj0XqABgrSww7Nqo7UVTSZLJUt2XRd
+      source: hyperkube-amd64:v1.6.4-3
+      source_hash: hnsj0XqABgrSww7Nqo7UVTSZLJUt2XRd
     addons:
       dns:
         domain: cluster.local