Ensure device mapper package is latest

Nova images won't boot with the version of device-mapper installed by
default on RedHat. We need to make sure we have the latest available
version, and it needs to refresh the libvirt and then the nova-compute
service after being updated.

manifests/profile/nova/compute.pp

@@ -24,5 +24,11 @@
     notify => Service['libvirt'],
   }
 
+  if $::osfamily == 'RedHat' {
+    package { 'device-mapper':
+      ensure => latest
+    }
+    Package['device-mapper'] ~> Service['libvirtd'] ~> Service['nova-compute']
+  }
   Package['libvirt'] -> File['/etc/libvirt/qemu.conf']
 }