DNS records for additional local IP addresses

##### ISSUE TYPE
* Feature Idea

##### COMPONENT NAME
* DNS

##### CLOUDSTACK VERSION
/

##### CONFIGURATION
* for customer isolated network

##### OS / ENVIRONMENT
/

##### SUMMARY
For adaptive computing it's important to get use of additional application local IP addresses which you can move between machines in case of a failure of one of the virtual machines or for upgrades.

I can attach an additional IP to a VM using ACS. But I cannot give that a separate name which does not belong to the actual hostname of the VM.

##### STEPS TO REPRODUCE

##### EXPECTED RESULTS
* possibility to add a DNS name for the additional local IP address
* possibility to move an IP from one system to another (no delete and recreate - IP could be taken in the steps between)

##### ACTUAL RESULTS
* currently the additional IP resolves into the same name as the original IP which is the hostname

Iniziare con il componente DNS di CloudStack e tracciare il modo in cui gli indirizzi IP locali aggiuntivi vengono attualmente risolti nel nome host di una VM. Definire come assegnare un nome DNS separato e come spostare un IP tra macchine virtuali senza eliminarle e ricrearle; il lavoro è completato quando entrambi i risultati previsti funzionano in una rete cliente isolata.

Scritto dal modello di indicizzazione a partire dal testo della issue.