aptly mirror parametrization

PROD-15379

Change-Id: Icff58138405245e968d63539ec7b0df2a313b6fd
diff --git a/aptly/server/mirror/ubuntu/xenial/influxdb.yml b/aptly/server/mirror/ubuntu/xenial/influxdb.yml
index a2ac597..2f61cb4 100644
--- a/aptly/server/mirror/ubuntu/xenial/influxdb.yml
+++ b/aptly/server/mirror/ubuntu/xenial/influxdb.yml
@@ -1,16 +1,20 @@
 parameters:
   _param:
     apt_mk_version: stable
+    mirror_influxdb-xenial_source: https://repos.influxdata.com/ubuntu/
+    mirror_influxdb-xenial_distribution: xenial
+    mirror_influxdb-xenial_components: stable
+    mirror_influxdb-xenial_gpgkeys:
+      - 2582E0C5
   aptly:
     server:
       mirror:
         influxdb-xenial:
-          source: https://repos.influxdata.com/ubuntu/
-          distribution: xenial
-          components: stable
+          source: ${_param:mirror_influxdb-xenial_source}
+          distribution: ${_param:mirror_influxdb-xenial_distribution}
+          components: ${_param:mirror_influxdb-xenial_components}
           architectures: amd64
-          gpgkeys:
-            - 2582E0C5
+          gpgkeys: ${_param:mirror_influxdb-xenial_gpgkeys}
           publisher:
             component: influxdb
             distributions: