[xenserver] added missing HostCpu model

lib/fog/xenserver/compute.rb

@@ -37,6 +37,7 @@ module Fog
       model  :guest_metrics
       model  :vbd_metrics
       model  :host_metrics
+      model  :host_cpu
 
       request_path 'fog/xenserver/requests/compute'
       request :create_server

lib/fog/xenserver/models/compute/host_cpu.rb

@@ -0,0 +1,37 @@
+require 'fog/core/model'
+
+module Fog
+  module Compute
+    class XenServer
+    
+      #
+      # A physical CPU
+      #
+      # @see http://docs.vmd.citrix.com/XenServer/6.0.0/1.0/en_gb/api/?c=host_cpu
+      #
+      class HostCpu < Fog::Model
+        
+        identity :reference
+        
+        attribute :uuid
+        attribute :family
+        attribute :flags
+        attribute :__host,          :aliases => :host
+        attribute :model
+        attribute :model_name,      :aliases => :modelname
+        attribute :number
+        attribute :other_config
+        attribute :speed
+        attribute :stepping
+        attribute :utilisation
+        attribute :vendor
+
+        def host
+          connection.hosts.get __host
+        end
+        
+      end
+      
+    end
+  end
+end