Public IP should be resource address if exists

[alonagetzler]

in case the VM has only private IP it should be the resource address
in case the VM has a private IP and a public IP (elastic or public) it should become the resource address

we should add a "Private IP" attribute on the deployed app and store the private ip there regardless if there is a public ip or not

QualiX should use the private ip attribute instead of the resource address

==> TBD, need to understand if that is indeed required

Roni: It didn't make sense to me when I saw it. I expected the address on the resource to be the 'front' facing address. Public when available and private when not. It also makes it clearer which instance is public and which isn't.

[alonagetzler]

we should consider this change as part of the VM Properties refactor #267