1.269: Add new table to generate a per virt_lan index for use with
       veth vlan tags. This would be so much easier if the virt_lans
       table had been split into virt_lans and virt_lan_members.
       Anyway, this table might someday become the per-lan table, with a
       table of member settings. This would reduce the incredible amount of
       duplicate info in virt_lans!

	CREATE TABLE virt_lan_lans (
	  pid varchar(12) NOT NULL default '',
	  eid varchar(32) NOT NULL default '',
	  idx int(11) NOT NULL auto_increment,
	  vname varchar(32) NOT NULL default '',
	  PRIMARY KEY  (pid,eid,idx),
	  UNIQUE KEY vname (pid,eid,vname)
	) TYPE=MyISAM;

       This arrangement will provide a unique index per virt_lan, within
       each pid,eid. That is, it starts from 1 for each pid,eid. That is
       necessary since the limit is 16 bits, so a global index would
       quickly overflow. The above table is populated with:

	insert into virt_lan_lans (pid, eid, vname)
            select distinct pid,eid,vname from virt_lans;