webadmin, userportal: cloud-init [5/6] - add to run vm once dialog

Support using cloud-init to perform initial setup of virtual machines.

Further details available at:
http://www.ovirt.org/Features/Cloud-Init_Integration

This patch introduces a Cloud-Init widget used in the Run Vm Once
dialog, which collects information from the user and in turn generates a
CloudInitParameters object used to construct cloud-init payload when
starting a VM.

Change-Id: I5c46ebb41ac97ecf08168c215911761e0fc497fd
Signed-off-by: Greg Padgett <gpadgett@redhat.com>