also add scaleway as a site

tsa/howto/new-machine.mdwn

@@ -11,6 +11,14 @@ release, testing. Here are site-specific installs:
 * [[new-machine-hetzner-robot]]
 * for a new machine in the [[ganeti]] cluster, see the [[ganeti]]
   configuration, "Adding a new instance" section
+* [[openstack]]
+
+The following sites are not documented yet:
+
+ * cymru
+ * [[KVM]]/libvirt
+ * scaleway
+ * sunet
 
 If you want to understand better the different installation procedures there is a
 install flowchart: