Live migration fom UI doesnot work on SM provisioned Livem cluter

Closes-Bug: #1381894
Issue: Live migration through openstack UI works, when the host is not a
FQDN, i.e only hostname and doesnt have domain name with it.
Openstack-ui picks the list the from the hostname.

Fix: Populate only hostname and not FQDN in /etc/hosts/
Test: validated by provisioning machine through server manager and
live migrate a VM.

Change-Id: Ic046ae38ad32f1bbc16b4ce315ebe90f5a2c4dff