Amend comment and device assignment related to HOST_IP_IFACE

Change-Id: I887bbd196cbb42b2ff1307ad5d62641432483d50
Change default network configuration

Change-Id: I47e6a7ad3fa2329371f20ee4c0937b5370ed4a03
Updated documentation, and use management network for ubuntu installation

Change-Id: Ic4c9d290b53caccb622a11c189544aa80c7fa9e2