Add WWN support

Add the disk attribute wwn to set the WWN of a disk drive.

Signed-off-by: christopher@voltz.us

README.md

@@ -777,6 +777,7 @@ It has a number of options:
   Disks with this option set to true need to be removed manually.
 * `shareable` - Set to true if you want to simulate shared SAN storage.
 * `serial` - Serial number of the disk device.
+* `wwn` - WWN number of the disk device.
 
 The following example creates two additional disks.
 

lib/vagrant-libvirt/config.rb

@@ -600,7 +600,8 @@ module VagrantPlugins
           cache: options[:cache] || 'default',
           allow_existing: options[:allow_existing],
           shareable: options[:shareable],
-          serial: options[:serial]
+          serial: options[:serial],
+          wwn: options[:wwn]
         }
 
         @disks << disk # append

lib/vagrant-libvirt/templates/domain.xml.erb

@@ -127,6 +127,9 @@
       <% if d[:serial] %>
         <serial><%= d[:serial] %></serial>
       <% end %>
+      <% if d[:wwn] %>
+        <wwn><%= d[:wwn] %></wwn>
+      <% end %>
 <%# this will get auto generated by Libvirt
       <address type='pci' domain='0x0000' bus='0x00' slot='???' function='0x0'/>
 -%>