Removed references to tcpcloud docker repos

Change-Id: Ibfb05319320c7f4fc86598e45f908a14105d39ea
diff --git a/aptly/client/publisher.yml b/aptly/client/publisher.yml
index 9aae28b..050bcea 100644
--- a/aptly/client/publisher.yml
+++ b/aptly/client/publisher.yml
@@ -6,4 +6,4 @@
       enabled: true
       source:
         engine: docker
-        image: tcpcloud/aptly-publisher
+        image: mirantis/aptly-publisher