kubernetes: stub service_from_json

Author: pinheadmz

Diff for: src/backends/kubernetes/kubernetes_backend.py

@@ -699,3 +699,6 @@ def wait_for_healthy_tanks(self, warnet, timeout=30):
         Wait for healthy status on all bitcoind nodes
         """
         pass
+
+    def service_from_json(self, obj):
+        pass