sdk: regenerate against the latest api

- to host.install() added ssh related arguments
- to template added virtio_scsi.enabled
- to vm added virtio_scsi.enabled
- added ability to attach a disk snapshot to the virtual machine
- to File class added 'content' field
- Payload class now reuses Files instead of own PayloadFile collection

Change-Id: If0ea500890f41d3bf58508a720cb183b7a6eb890
Signed-off-by: Michael pasternak <mpastern@redhat.com>