aptly mirror parametrization

PROD-15379

Change-Id: Icff58138405245e968d63539ec7b0df2a313b6fd
diff --git a/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml b/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml
index 0b40092..5caa9b5 100644
--- a/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml
+++ b/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml
@@ -1,14 +1,19 @@
 parameters:
+  _param:
+    mirror_rabbitmq-testing-trusty_source: http://www.rabbitmq.com/debian/
+    mirror_rabbitmq-testing-trusty_distribution: testing
+    mirror_rabbitmq-testing-trusty_components: main
+    mirror_rabbitmq-testing-trusty_gpgkeys:
+      - 056E8E56
   aptly:
     server:
       mirror:
         rabbitmq-testing-trusty:
-          source: http://www.rabbitmq.com/debian/
-          distribution: testing
-          components: main
+          source: ${_param:mirror_rabbitmq-testing-trusty_source}
+          distribution: ${_param:mirror_rabbitmq-testing-trusty_distribution}
+          components: ${_param:mirror_rabbitmq-testing-trusty_components}
           architectures: amd64
-          gpgkeys:
-            - 056E8E56
+          gpgkeys: ${_param:mirror_rabbitmq-testing-trusty_gpgkeys}
           publisher:
             component: rabbitmq
             distributions: