Subo:
- función halt (parar infraestructura) implementada.

 On branch infrastructure-upstream
 Changes to be committed:

	modified:   src/CygnusCloud/clusterServer/reactor/clusterServerReactor.py
	modified:   src/CygnusCloud/database/clusterServer/clusterServerDB.py
	modified:   src/CygnusCloud/virtualMachineServer/main.py