tidy up of ubuntu_template.sh

Change-Id: Ied113d23ece536333add0b3c9204ddf0e94b135e
add new material to configure_xenserver_network

Change-Id: Ic07247f22a14639ffbb408ece2051bd6a3d50ef0
tidy configure_xenserver_network

Change-Id: Ic2e2cb9cc458a33a62f4fad9f185efe1dce3538f