pm-utils needed by compute nodes for the power operations of VMs

Cherry picked from https://review.openstack.org/#/c/43423/

Fixes: bug# 1208974

Change-Id: Id499cdf5d74a548a7319bcc5a47d2916434ea157

manifests/compute.pp

@@ -54,4 +54,8 @@ class nova::compute (
     nova_config { 'DEFAULT/libvirt_use_virtio_for_bridges': value => true }
   }
 
+  package { 'pm-utils':
+    ensure => present,
+  }
+
 }

spec/classes/nova_compute_spec.rb

@@ -40,6 +40,9 @@ describe 'nova::compute' do
         :ensure => 'present',
         :before => 'Nova::Generic_service[compute]'
       ) }
+      it { should contain_package('pm-utils').with(
+        :ensure => 'present'
+      ) }
 
       describe 'with enabled as true' do
         let :params do