Signed-off-by: endika <endika.aldecoa@ehu.eus>

Deleted hackfest_virtual-pc_vnfd/charms/virtual-pc/hooks/install, hackfest_virtual-pc_vnfd/charms/virtual-pc/hooks/start, hackfest_virtual-pc_vnfd/charms/virtual-pc/hooks/upgrade-charm files

A simple descriptor that uses a native charm to launch a clean
Ubuntu base image and layer a graphical desktop environment
and RDP server on top.

Signed-off-by: beierlm <mark.beierl@canonical.com>