Update notes for submitted changes

* Multinode: Allow one device to boot another device
Update notes for submitted changes

* Preserve SELinux support in test images and tarballs
Update notes for submitted changes

* Adding support for mount and umount
Update notes for submitted changes

* Test definition handlers
Update notes for submitted changes

* Outline of a new Device class
Update notes for submitted changes

* cubieboard3: enable kernel dhcp for ramdisk booting
Update notes for submitted changes

* cubieboard3: fix typo in boot_cmds_nfs
Update notes for submitted changes

* Add missing unit test support files