add support for docker daemon.json configuration

Change-Id: Ib254c9a9c0e55131817268b9798612800508949b
diff --git a/metadata/service/host/init.yml b/metadata/service/host/init.yml
index c8a4f26..6355b8b 100644
--- a/metadata/service/host/init.yml
+++ b/metadata/service/host/init.yml
@@ -6,6 +6,7 @@
   docker:
     host:
       enabled: true
-      log:
-        engine: json-file
-        size: 50m
+      options:
+        log-driver: json-file
+        log-opts:
+          max-size: 50m