Live migration failure bug.

In nova.conf when are generated by kolla-ansible, The vncserver_listen and server_listen item should be 0.0.0.0, not the api_interface IP.
Because, the nova live migration requires vnc listen IP not bind with specific host, Here is the code in nova:
      def _check_graphics_addresses_can_live_migrate(self, listen_addrs):
        LOCAL_ADDRS = ('0.0.0.0', '127.0.0.1', '::', '::1')

        local_vnc = CONF.vnc.vncserver_listen in LOCAL_ADDRS
        local_spice = CONF.spice.server_listen in LOCAL_ADDRS

        if ((CONF.vnc.enabled and not local_vnc) or
            (CONF.spice.enabled and not local_spice)):

            msg = _('Your libvirt version does not support the'
                    ' VIR_DOMAIN_XML_MIGRATABLE flag or your'
                    ' destination node does not support'
                    ' retrieving listen addresses. In order'
                    ' for live migration to work properly, you'
                    ' must configure the graphics (VNC and/or'
                    ' SPICE) listen addresses to be either'
                    ' the catch-all address (0.0.0.0 or ::) or'
                    ' the local address (127.0.0.1 or ::1).')
            raise exception.MigrationError(reason=msg)

Modify the nova.conf.j2 file:
   vncserver_listen = 0.0.0.0
   server_listen = 0.0.0.0