Add support for virtio-scsi via stemcell cloud properties

[leosco]

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

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: leosco / name: Leo Scordilis (4547ee12595b118aa1bfac56a5f766decff84893)

[jpalermo]

Adding reviewers. Could you also sign the CLA?

[sainaveenkumargedala]

Hello @leosco,

Can you also add this property hw_vif_multiqueue_enabled=true along with the properties that are available in this PR hw_disk_bus=scsi and hw_scsi_model=virtio-scsi

Thanks, SaiNaveenKumarGedala

[leosco]

Adding reviewers. Could you also sign the CLA?

Still waiting on approval for this, apologies for the delay

[rkoster]

@leosco any update on the CLA?

[leosco]

@rkoster all set