Prepare a new release for victoria cut off

This patch fixes the version bump made by the previous preparation
patch, ab9d6c5349. Since some features
has been added since the previous release, we should update y release
instead of z release.

Change-Id: Ifcd5ce9e90c2040952a22679da031d43edfd5362

metadata.json

@@ -83,5 +83,5 @@
     ],
     "source": "git://github.com/openstack/puppet-nova.git",
     "summary": "Puppet module for OpenStack Nova",
-    "version": "17.4.1"
+    "version": "17.5.0"
 }