Add support for handling replace case and rollback for Server resource
with internal port.
This patch adds ability to replace server with specified ip address and
ability to make correct rollback if updated replace failed.
Logic is similar on code introduced for Port resource, but here we
extend existing resource data - "internal ports", by adding new key
'fixed_ips' in dictinary with port 'id'.
implements bp rich-network-prop
Change-Id: Id44bb358c9c874afa6644f126d284f31b6639b63
8b22a11fc6