Fix milestone and release ppa config

Previously, a copy and paste error had resulted
in 3 definitions of the trunk ppa class.

Two of those were intended to be swift::repo::trunk
and swift::repo::release.

This commit corrects this error.

manifests/repo/milestone.pp

@@ -1,6 +1,6 @@
 #
 # sets up the swift milestone ppa
 #
-class swift::repo::trunk {
+class swift::repo::milestone {
   apt::ppa { 'ppa:swift-core/milestone': }
 }

manifests/repo/release.pp

@@ -1,6 +1,6 @@
 #
 # sets up the swift trunk ppa
 #
-class swift::repo::trunk {
+class swift::repo::release {
   apt::ppa { 'ppa:swift-core/release': }
 }

manifests/storage.pp

@@ -61,7 +61,7 @@ class swift::storage(
   }
 
   Swift::Storage::Server {
-    devices               => $devices,
+    devices              => $devices,
     storage_local_net_ip => $storage_local_net_ip,
   }