Use either a virtual IP@ or a list of physical IP@ for the exportd
Up to now the exportd has a virtual IP address that was announced
on the host where the exportd was active. The other RozoFS entities
knew only this virtual IP address.
It is now not necessary to use a virtual IP address. Each RozoFS
entity that needs it, knows the physical IP address of each host
that can handle the active exportd.
For instance the rozofsmount can have in its command line either
a virtual IP address (i.e -H "192.168.10.1") or a list or physical
IP addresses (i.e -H "192.168.1.1/192.168.2.1/192.168.3.1/192.168.4.1")