This is done in the Domain role code, so it will
work for all the domains. Notice only the domains
that are shut down from ravada get removed. Any
domain that is shut down by the user will remain.
We still need some kind of garbage collector.

Running domains may not claim all the memory they
need right away. Nevertheless they will eventually
use it and it may render the server unusable when
there are many domains starting at the same time.
This precondition check fixes it.

Also failing tests for this issue are fixed.

Currently setting memory won't work with KVM I don't
know why.

If the current VM has a host we get the IP from there.
Added display_ip configuration support.

Added refresh_storage method for VMMs with storage
like KVM.

this enables this method for future implementations