Create standalone_libvirt_api.py

# libvirt api for kvm
# you need libvirt-bin,qemu-kvm and python-libvirt package installed
# tested on ubuntu 12.04.3 server, libvirtd version 0.9.8
# for more information, please visit
# https://github.com/hysteria087/virt-api

# if you see the github repository, you may get all there
# vm-agent code, working as a linux service.
# Below, the code you see is not all libvirt_api.py code,
# the original one needs also another libraries.
# I cleaned it, so it will work as standalone python script
# just comment out the bottom of file and run it.