TT#37257 Save origin name of the installation interface

If the installation device is virtual it is necessary to redefine
DEFAULT_INSTALL_DEV variable to the name of real interface but
save the origin name to stop it.

Change-Id: I9e59ca8411e713235a0e0e5407ef0c3acc30e299

templates/scripts/includes/deployment.sh

@@ -1364,6 +1364,7 @@ DHCP="${DHCP}"
 EXTERNAL_DEV="${EXTERNAL_DEV}"
 GW="${GW}"
 EXTERNAL_NETMASK="${EXTERNAL_NETMASK}"
+ORIGIN_INSTALL_DEV="${INSTALL_DEV}"
 EOF
 
   if "${TRUNK_VERSION}" && checkBootParam ngcpupload ; then