Added EXT_NETWORK for Icehouse

First of all, deploy-rdo.sh can take now Icehouse.

In Icehouse, the Controller node needs 2 networks (MNGMT & EXT), instead
of just 1 in Havana. So I added this in deploy-rdo-esxi-vms.sh.

In configure-rdo.sh I added a line for bringing & setting up the second
network on Controller (eth1).