vnc: -readconfig fix Now that -vnc goes through QemuOpts we can get vnc configuration via -readconfig too. So setting display_remote in the command line parsing code doesn't cut it any more, we must check QemuOpts instead to see whenever any vnc display is configured. Reported-by: Markus Armbruster <armbru@redhat.com> Tested-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>