[one-users] Keep all the data from host_pool

[Carlos Fernández Iglesias]

Hello,

I've noticed that when a host is deleted from opennebula it's 
information is also deleted from the database. This also applies to 
images, networks and users.

For accounting purposes it will be great to have none of the database 
information erased as you may need that info in some scenario, and it 
may not be there.

Is there some way to prevent this from happening?

Thanks.