aptly mirror parametrization

PROD-15379

Change-Id: Icff58138405245e968d63539ec7b0df2a313b6fd
diff --git a/aptly/server/mirror/debian/sensu.yml b/aptly/server/mirror/debian/sensu.yml
index 0361538..9e2f5a1 100644
--- a/aptly/server/mirror/debian/sensu.yml
+++ b/aptly/server/mirror/debian/sensu.yml
@@ -1,18 +1,22 @@
 parameters:
   _param:
     apt_mk_version: stable
+    mirror_sensu_source: http://sensu.global.ssl.fastly.net/apt
+    mirror_sensu_distribution: sensu
+    mirror_sensu_components: main
+    mirror_sensu_gpgkeys:
+      - EB9C94BB
   aptly:
     server:
       mirror:
         sensu:
-          source: http://sensu.global.ssl.fastly.net/apt
-          distribution: sensu
-          components: main
+          source: ${_param:mirror_sensu_source}
+          distribution: ${_param:mirror_sensu_distribution}
+          components: ${_param:mirror_sensu_components}
           architectures: amd64
-          gpgkeys:
-            - EB9C94BB
+          gpgkeys: ${_param:mirror_sensu_gpgkeys}
           publisher:
             component: sensu
             distributions:
               - ubuntu-trusty/${_param:apt_mk_version}
-              - ubuntu-xenial/${_param:apt_mk_version}
+              - ubuntu-xenial/${_param:apt_mk_version}
\ No newline at end of file