Add support for virtio-scsi via stemcell cloud properties

References:

- https://wiki.openstack.org/wiki/Documentation/HypervisorTuningGuide#Symptoms_of_Being_Disk_Bound
- https://wiki.openstack.org/wiki/Documentation/HypervisorTuningGuide#Instance_and_Image_Configuration_4

src/bosh_openstack_cpi/lib/cloud/openstack/stemcell_creator.rb

@@ -118,7 +118,8 @@ def unpack_image(tmp_dir, image_path)
     def self.normalize_image_properties(properties)
       image_properties = {}
       image_options = %w[version os_type os_distro architecture auto_disk_config
-                         hw_vif_model hypervisor_type vmware_adaptertype vmware_disktype
+                         hw_vif_model hw_disk_bus_model hw_scsi_model hw_disk_bus
+                         hypervisor_type vmware_adaptertype vmware_disktype
                          vmware_linked_clone vmware_ostype]
       image_options.reject { |image_option| properties[property_option_for_image_option(image_option)].nil? }.each do |image_option|
         image_properties[image_option.to_sym] = properties[property_option_for_image_option(image_option)].to_s

src/bosh_openstack_cpi/spec/unit/stemcell_creator_spec.rb

@@ -18,6 +18,20 @@
       expect(subject.normalize_image_properties(properties)).to have_key(:version)
     end
 
+    it 'supports virtio-scsi properties' do
+      properties = {
+        'hw_disk_bus_model' => 'virtio-scsi',
+        'hw_scsi_model' => 'virtio-scsi',
+        'hw_disk_bus' => 'scsi',
+      }
+
+      expect(subject.normalize_image_properties(properties)).to include(
+        :hw_disk_bus_model,
+        :hw_scsi_model,
+        :hw_disk_bus,
+      )
+    end
+
     it 'maps hypervisor key to hypervisor_type' do
       properties = {
         'hypervisor' => 'kvm',