virsh: domdisplay: if listen is 0.0.0.0 or [::] print address from URI

virsh: domdisplay: if listen is 0.0.0.0 or [::] print address from URI

Currently if a guest has listen address 0.0.0.0 or [::] and you run
"virsh domdisplay $domain" you always get "spice://localhost:$port".

We want to print better address if someone is connected from a different
computer using "virsh -c qemu+ssh://some.host/system".  This patch fixes the
behavior of virsh to print in this case "spice://some.host:$port".

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1332446

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>