Speed up ACS status check

[marco-buttu]

To know the status of containers and ACS we are running a subprocess. This action can slow down the jobs, in case of fast sampling time. We should implement a better solution, in this way:

• a job (acs_monitor) is in charge of checking the manager status and container status; it knows the list of containers to be checked because that list is stored when the component is istantiated (I save the container names on Redis).
• inside the attribute jobs I check the ACS and containers status by looking at the values wrote by acs_monitor