Summary: KVM - use virtio socket to communicate config to system vms

Detail: This gets rid of the patchdisk method of passing cmdline and
authorized_keys to KVM system VMs. It instead passes them to a virtio socket,
which the KVM guest reads from the character device /dev/vport0p1 during
cloud-early-config. Tested to work on CentOS 6.3 and Ubuntu 12.04. Should
work with even older versions of libvirt.

Signed-off-by: Marcus Sorensen <marcus@betterservers.com> 1362691685 -0700
CLOUDSTACK-1: Working on the new install docs for compiling w/Maven