spice: fix "info spice"

In case no listening address was specified, "info spice" reports
"0.0.0.0" as address.  Which is incorrect in case spice is listening
on ipv6.  Replace it by a wildcard "*" to indicate it is not limited
to a specific address.

Note:  Being more specific is not possible without extending the
spice-server api.  The socket is handled by spice-server not
qemu, so qemu can't easily figure the actual socket address.

Reported-by: David Jaša <djasa@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
spice: fix libvirt snapshots

Only notify spice-server about migration events in case we got
target host information beforehand.  So we kick the seamless spice
client migration only in case a actual live migration happens, not
when libvirt uses live-migration-to-file for snapshotting.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Merge remote-tracking branch 'remotes/spice/tags/pull-spice-7' into staging

spice: small fixes

# gpg: Signature made Thu 08 May 2014 09:50:21 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/spice/tags/pull-spice-7:
  spice: fix libvirt snapshots
  spice: fix "info spice"

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>