Sigo limpiando el código del servidor de máquinas virtuales.

 On branch issue_34
 Changes to be committed:

	modified:   clusterServer/networking/packets.py
	modified:   imageRepository/imageRepository.py
	modified:   virtualMachineServer/libvirtInteraction/xmlEditor.py
	modified:   virtualMachineServer/networking/callback.py
	modified:   virtualMachineServer/networking/packets.py
	modified:   virtualMachineServer/reactor/vmServerReactor.py