update preffix, in order to avoid pkg conflicts on pool
diff --git a/aptly/server/mirror/ubuntu/trusty/salt.yml b/aptly/server/mirror/ubuntu/trusty/salt.yml
index f009167..76458bc 100644
--- a/aptly/server/mirror/ubuntu/trusty/salt.yml
+++ b/aptly/server/mirror/ubuntu/trusty/salt.yml
@@ -12,5 +12,5 @@
           publisher:
             component: salt
             distributions:
-              - nightly/trusty
+              - trusty/nightly