Mechanism to cleanup all ImageCaches

This spec talks about creating a mechanism to cleanup all the image
caches (leveraging most of the code that is already in pxe driver).

Change-Id: I7608cf327bb40ff6bac53ee527cd42704888a5e8
iLO Virtual Media iSCSI Deploy Driver

Add ability to provision proliant baremetal nodes (having iLO4 and
beyond) by booting the baremetal node with virtual media and
using iscsi from conductor node to deploy the image (reusing
existing deploy mechanism).

Change-Id: Ib01518dda95b3bfb650c4eb469a9355311bfab02
iLO-IPA Deploy Driver

This spec talks about creating a new driver which will use iLO virtual
media as the boot mechanism and IPA as the deploy engine.

Change-Id: Ic2856a349f57dd15126740c128a2e24b7270810a