snapshot_import delete serial and console when is disabled
snapshot_import delete serial and console when is disabled

Importing the snapshot when --serial_files False the xmls
imported have the serial and console and they are not deleted
before starting the Vms.

This patch ensure that the serial and console is deleted from the xml before
redefining the VMs.

Change-Id: I1880b89fcc7efa75055be9b1b9e952a126b14176

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared