Fix local repo for sensu

Change-Id: Ib0cc1505dd64bccd13bfa038059e156381567cf1
diff --git a/aptly/server/mirror/debian/sensu.yml b/aptly/server/mirror/debian/sensu.yml
index 10f3926..0361538 100644
--- a/aptly/server/mirror/debian/sensu.yml
+++ b/aptly/server/mirror/debian/sensu.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    apt_mk_version: stable
   aptly:
     server:
       mirror:
@@ -10,7 +12,7 @@
           gpgkeys:
             - EB9C94BB
           publisher:
-            component: extra
+            component: sensu
             distributions:
-              - trusty/nightly
-              - xenial/nightly
+              - ubuntu-trusty/${_param:apt_mk_version}
+              - ubuntu-xenial/${_param:apt_mk_version}